7 Best Soil pH Testers For UK Gardens (2026 Guide)

Best Overall

Product Image

Model/Make

Sonkir

Digital

Analogue

Functionality

3 in 1

Batteries Required

More Information

Runner-Up

Product Image

Model/Make

Luster Leaf

Digital

Analogue

Functionality

Test Kit

Batteries Required

More Information

Highly Recommended

Product Image

Model/Make

Garden Tutor

Digital

Analogue

Functionality

Ph Test Strip

Batteries Required

More Information

Last update on 2026-11-04

Best Soil pH Testers For Your Garden – A Buyer’s Guide

Sonkir pH Meter

The Sonkir pH meter MS02 is a 3-1 analogue ‘double probe’ soil tester.

The meter is capable of measuring not only the pH of the soil in the range of 3.5 – 8, but also the soil moisture content from dry 1 – 3, moist 4 – 7, and wet 8 -10.

Light can also be measured in lux from 0 dark to 2000 light.

The Sonkir pH test meter utilises double-needle detection technology. This technology passes ‘detailed information between the 2x conductors’ to show you accurate metering values. The double sensor probes are 8in (20cm) long and are 1 x copper and 1 x aluminium.

The Sonkir’s twin-probe design allows it to check soil moisture, light and pH using the same simple meter. While the moisture function can be useful for everyday gardening, treat the pH reading as a rough guide rather than a precise measurement, as the meter cannot be calibrated by the user.

The meter is fairly lightweight, robust, and portable, measuring just 11.5 inches (29 cm) long. The letters and numbers are easily legible on the screen.

The Sonkir MS02 doesn’t need batteries, so it’s ready to use whenever you need it. First, make sure the probe is clean, then insert it into moist soil to a depth of around 2–4 inches (5–10 cm), taking care to avoid stones and very hard ground. Move the switch to the measurement you want — pH, moisture or light — and allow up to 10 minutes for the reading to settle. Treat the pH result as a general guide rather than a precise measurement. After testing, wipe the probes clean and store the meter somewhere safe and dry.

To check light levels, position the meter’s light sensor so it faces the light source you want to measure. Remember that this measures the light reaching the sensor, not the light available throughout the plant’s growing area.

The manufacturer describes the Sonkir MS02 as factory-set, and there is no facility for users to calibrate it with pH buffer solutions. This means you cannot check or adjust its pH readings yourself. For general gardening, the meter can offer an indication of soil conditions, but I wouldn’t rely on it for precise pH measurements, particularly when growing plants with specific soil requirements.

Finally, it should be stressed that the Sonkir pH meter is a SOIL pH tester, not a water or a liquid pH tester. This tester can ONLY be placed in soil.

Warranty

Manufacturer’s warranty: Check before buying. I couldn’t confirm a standard warranty period that applies to every UK purchase of the Sonkir MS02. Check the warranty information supplied with the product and the terms offered by the Amazon UK seller before ordering. Amazon’s returns policy is separate from any manufacturer’s warranty.

Conclusion

The Sonkir MS02 is a handy, budget-friendly choice if you want to check soil moisture, light and pH with one simple tool. Its battery-free design and straightforward operation make it appealing for everyday gardening. However, its pH readings are best treated as a rough guide rather than a precise result. If you need more dependable measurements for plants with specific soil requirements, a dedicated pH tester with calibration may be a better investment.

Pros

Cons

Price

3-in-1 Testing
Battery-Free Operation
Easy to Use
Portable Design
Twin-Probe Construction

Approximate pH Readings
No User Calibration
Requires Moist Soil For Testing

Rapitest pH Soil Tester

If you’d like a straightforward way to check your garden soil’s pH and nutrient levels, the Luster Leaf Rapitest Soil Test Kit is worth considering. It gives you a simple way to find out more about your soil and whether it may need a helping hand.

The Luster Leaf 1601 Rapitest kit tests more than just soil pH. It also checks the three main soil nutrients: nitrogen (N), phosphorus (P) and potassium (K). The pack includes 40 test capsules in total – 10 for each test.

This makes it a handy little kit if you want a broader picture of your garden soil’s condition rather than just its acidity or alkalinity.

The kit uses chemical test capsules that react with a prepared soil solution to produce a colour change. You then compare the resulting colour with the supplied chart to estimate the soil’s pH or nutrient level, depending on which test you’re carrying out.

One thing worth bearing in mind is that the test capsules are consumables, so you’ll need to buy more when the original supply runs out. The Luster Leaf 1663 Professional Soil Test Kit is another option to consider, with 40-and 80-test versions listed on Amazon. However, if you test your soil regularly, it may be worth comparing the ongoing cost of replacement chemicals with the cost of a digital or analogue soil pH tester.

What Can the Luster Leaf Rapitest 1601 Test?

The kit checks four important aspects of your soil:

Soil pH: Shows whether your soil is acidic or alkaline.
Nitrogen: Helps identify whether your soil may need additional nitrogen to support healthy leaf and stem growth.
Phosphorus: Helps identify a possible deficiency that could affect root development and overall plant growth.
Potassium (Potash): Indicates whether your soil may need additional potassium, which supports general plant health, flowering and fruiting.

To begin a soil pH test, collect a small sample from the area you want to check, taking it from around 2–4 inches (5–10 cm) below the soil surface. Place the sample into the appropriate test chamber supplied with the Rapitest kit, following the manufacturer’s instructions.

Next, open one of the pH test capsules and add its contents to the soil sample in the test chamber. Use the amount specified in the manufacturer’s instructions.

Next, add distilled water to the test chamber, filling it to the marked line. Fit the cap securely and shake the comparator to mix the soil, capsule contents and water. Leave the mixture to settle for about one minute, allowing the colour to develop.

Once the mixture has settled, compare the colour of the solution with the pH chart on the side of the comparator to estimate your soil’s pH. For the best results, check the colour in natural daylight, but avoid direct sunlight, which can make colour matching more difficult. That’s all there is to it – a quick and straightforward way to get an indication of your soil’s pH.

For a more representative result, I recommend collecting small samples from several spots within the area you want to test and mixing them together in a clean bowl. Remove any obvious pieces of plant material, such as roots, leaves or grass, before mixing the soil thoroughly. Then use a small amount of the mixed sample for your test. It’s best to avoid handling the soil more than necessary, as this helps prevent contamination.

The Luster Leaf 1601 Rapitest kit can be used with both indoor and outdoor plants and is suitable for a range of soil types, including sandy, loamy and clay soils. It’s straightforward to use, but the kit also comes with detailed instructions and a soil pH preference list covering more than 450 plants. This makes it a useful option for beginners as well as more experienced gardeners.

Warranty

I couldn’t confirm a manufacturer’s warranty period specifically for the Rapitest 1601 that applies to UK purchases. Check the warranty information provided by the Amazon UK seller before ordering. Remember that Amazon’s returns policy is separate from any manufacturer’s warranty.

Conclusion

Overall, the Luster Leaf 1601 Rapitest is a handy kit for gardeners who want to keep an eye on both soil pH and the main nutrient levels. It offers more information than a basic pH-only tester and includes a useful plant preference list to help you interpret the results. Just bear in mind that the colour-based readings are estimates rather than precise laboratory measurements. For general garden checks, though, it’s a useful addition to your gardening toolkit.

Pro’s

Con’s

Price

Quick and Easy to Use
Tests Soil pH And Three Main Nutrients
Suitable For Indoor And Outdoor Plants
Plant pH Preference List Covers Over 450 Plants
No Experience Required

pH Range May be Limited For Some Testing Needs
Replacement Test Capsules Add to The Ongoing Cost
Colour Matching Can Be Subjective

Garden Tutor Soil pH Test Strips

The Garden Tutor soil pH test strips offer a simple way to check your garden soil’s pH.

They are advertised as covering a range from 3.5 to 9, making them suitable for gardeners who want a quick indication of whether their soil is acidic, neutral or alkaline.

The kit contains 100 test strips for checking the pH of soil used for indoor and outdoor plants, lawns, vegetable gardens, fruit and flowers. This makes it a useful option for gardeners who want to test several areas of their garden without spending too much.

The kit also includes a 16-page, full-colour pH testing handbook, complete with lime and sulphur application charts. This is a useful extra, particularly if you’re new to soil testing and want some guidance on how to adjust your soil’s pH.

The test strips are compact and easy to carry, with straightforward instructions for use. Each strip has four colour indicator pads. Once the colours have developed, compare them with the manufacturer’s colour chart to estimate your soil’s pH. The process is simple, although matching colours can sometimes be a little subjective.

Another useful feature is Garden Tutor’s AI-assisted pH test strip reader. You can use a smartphone or other suitable device with a web browser to access the online application, which helps analyse the colours on your test strip. This offers an alternative to comparing the colours by eye, although the result should still be treated as an estimate rather than a laboratory measurement. A smartphone is not included, and you’ll need internet access to use the online reader.

To test your soil, mix a small sample with distilled water and leave it to stand for around 30 minutes. Dip a test strip into the liquid, remove it and allow the colour pads to develop according to the instructions. Then compare the colours with the manufacturer’s chart on the test strip container to estimate the soil’s pH. It’s a straightforward process, but follow the instructions supplied with the kit for the correct soil-to-water ratio and testing time.

Distilled water is best because it contains very few dissolved minerals that could interfere with the result. Clean rainwater can be used as an alternative, but tap water is best avoided because its dissolved minerals and treatment chemicals may affect the reading.

One small drawback is that matching the colour pads to the chart isn’t always straightforward. Although the chart shows 0.5 pH intervals, some of the shades can be difficult to distinguish, particularly when two readings are close together. I’d treat the result as a useful guide rather than a precise measurement.

The main challenge is judging the colour accurately. For example, it can be difficult to tell the difference between readings such as pH 6.5 and 7.0. This is worth bearing in mind if you’re trying to make small adjustments to your soil’s pH. For general garden checks, however, the strips should give you a useful indication of whether your soil is acidic or alkalin

Warranty

I couldn’t confirm a manufacturer’s warranty period for the Garden Tutor Soil pH Test Kit. Check the product details and seller’s terms before ordering. Remember that Amazon’s returns policy is separate from any manufacturer’s warranty.

Conclusion

The Garden Tutor Soil pH Test Kit offers good value for money, particularly with 100 test strips, a handy testing handbook and the option of an online AI-assisted reader. It’s straightforward enough for everyday garden use and covers a useful pH range of 3.5 to 9. The main drawback is that colour matching can be difficult, especially when readings are close together. However, if you’re looking for an affordable way to keep an eye on your garden soil’s pH, this kit is well worth considering.

At £12.99, the handbook and online reader make this a more appealing package than a basic test-strip kit.

Pro’s

Con’s

Price

Easy to Use
100 Tests per Pack
Portable and Convenient
No Batteries Required
Colour Chart Included
16-Page Testing Handbook Included
AI-Assisted Online Test Strip Reader

Colour Matching Can Be Tricky
Readings Are Estimates Rather Than Precise Measurements

Kensizer Soil Tester, Soil Moisture/pH Meter

If you’re a gardener, landscaper or farmer, knowing your soil’s pH and moisture levels can help you understand what your plants need.

Poor soil conditions can lead to stunted growth or even plant death. The 2-in-1 Kensizer Soil and Moisture Tester offers a simple way to check both.

The Kensizer comes with two separate meters: one for soil pH and one for moisture. Both use analogue dials, so you can read the results directly without batteries.

The pH dial is marked from 3 to 10, with the acidic range (3–7) shown in red and the alkaline range (8–10) in turquoise.

Kensizer soil pH and moisture tester with probe

The moisture dial also uses a numbered scale from 1 to 10, with red indicating lower readings (1–3), turquoise the middle range and blue the higher readings.

These colour-coded scales make the results easy to read, although the pH reading should be treated as a general guide rather than a precise measurement.

As with other basic soil testers of this type, treat the pH reading as a guide rather than a precise measurement.

However, the manufacturer indicates that pH readings can differ from the actual value by around 1–2 pH units, so treat the results as a rough guide rather than a precise measurement.

One advantage of the Kensizer is that it requires no batteries, so there are no batteries to replace and no ongoing battery costs. It’s straightforward to use: simply insert the appropriate probe into the soil and take your reading.

So how does the Kensizer work without batteries? It uses the electrical properties of the soil to produce pH and moisture readings. However, these readings are only estimates, particularly for pH, so it’s best used as a simple guide to soil conditions rather than a precision measuring instrument.

Once the probe is inserted into the soil, the Kensizer produces a reading based on the soil’s electrical properties. The large, easy-to-read display is a handy feature, especially if you find smaller numbers difficult to see. Just remember that the pH reading is an estimate, so use it as a general guide rather than relying on it for precise measurements.

To check your soil, gently insert the Kensizer’s probe about 2–4 inches (5–10 cm) into the ground, avoiding stones and very hard soil. Leave it in place for around 1–2 minutes to allow the reading to settle. The pH result should be treated as a rough guide rather than an exact measurement. If the soil is very dry, lightly water it first and allow the moisture to soak in before testing.

The Kensizer is lightweight and portable, with each probe measuring approximately 7.1 inches (18 cm). Each meter is around 10.4 inches (26.4 cm) long and 2 inches (5.1 cm) wide. The product weighs approximately 3 oz (85 g), making it easy to carry around the garden and use wherever you need it.

One important thing to remember: the Kensizer is designed for testing soil, not pure water or other liquids. Don’t force the probes into hard or stony ground, as this could damage them.

Once you’ve taken your readings, remove the probes from the soil and wipe them clean with a soft cloth. It’s also important not to leave the meters sitting in the soil for long periods, as this can damage the probes. Store them somewhere safe and dry until you need them again.

Warranty

I couldn’t confirm a standard manufacturer’s warranty period for the Kensizer Soil and Moisture Tester. Before buying, check the product information and the terms offered by the Amazon UK seller. Remember that Amazon’s returns policy is separate from any manufacturer’s warranty.

Conclusion

The Kensizer Soil and Moisture Tester is a simple, budget-friendly tool for gardeners who want a quick indication of soil moisture and pH without worrying about batteries. Its large display and straightforward operation are appealing, especially for everyday garden checks.

However, its pH readings are only a rough guide, so I wouldn’t rely on it when precise measurements matter, such as when adjusting soil for plants with specific pH requirements. For general garden use on a budget, it can still be a handy little tool.

Pros

Cons

Price

Large, Easy-to-Read Dials
No Batteries Required
Measures Soil pH and Moisture
Suitable for Indoor And Outdoor Use
Lightweight and Portable

No User Calibration
pH Readings May be Inaccurate

Hanna GroLine HI981030 Soil pH Tester

If you want a more precise way to check your garden soil’s pH, the Hanna GroLine HI981030 is worth considering.

I’d consider it for anyone who regularly checks soil pH or grows plants that need particular soil conditions

Key Features

It’s considerably more expensive than a basic soil tester, but you get a digital display, calibration solutions and a probe designed specifically for testing soil.

pH Readings and Accuracy

The Hanna measures pH from 0.00 to 12.00, displaying readings to two decimal places.

The manufacturer quotes an accuracy of ±0.05 pH at 25°C (77°F) under its stated test conditions. Automatic temperature compensation takes care of temperature adjustments for you.

You’ll need to calibrate the tester using the supplied pH 4.01 and 7.01 solutions. It’s not difficult once you get used to it, but it’s an extra job to factor in if you’re accustomed to a simple probe you just push into the ground.

Probe and Construction

The glass-tipped probe is designed for soil testing, but you shouldn’t force it into hard, dry or stony ground. A small soil auger is included to help prepare a suitable hole. The outer sleeve can be removed for cleaning, and you can refresh the probe’s reference junction using the supplied electrolyte. That’s a useful feature if you want to maintain the tester rather than replace it at the first sign of trouble.

Size, Battery and What’s Included

The tester measures approximately 5.9 × 2 × 0.9 inches (151 × 51 × 21 mm) and weighs around 1.6 oz (44 g). It runs on an included CR2032 battery, with a manufacturer-quoted life of approximately 800 hours of continuous use.

You also get calibration solutions, cleaning solutions for soil and humus deposits, electrode storage solution, replacement bridge electrolyte, a soil auger and an instruction manual. That’s a helpful starter kit, although you will need to keep the probe clean and store it correctly between uses

Is It Worth Buying?

I’d put this in the serious-gardener category rather than recommend it to everyone. Its detailed readings and maintainable probe are appealing, but you’ll need to look after it and calibrate it regularly. Customer feedback is not uniformly positive, so I wouldn’t buy it on the assumption that it will always give perfect readings without effort. If you only check your soil occasionally, a cheaper tester may be all you need.

Warranty

Hanna specifies a one-year manufacturer’s warranty, subject to its conditions. Check the Amazons terms before ordering.

Pro’s

Con’s

Price

Detailed Readings
Calibration Solutions Included
Maintainable probe
Cleaning Kit Included
Battery Included
12 – Month Warranty

Quite Expensive
Needs Regular Care
Glass Tip Needs Care
Calibration Required

Yamron 7 in 1 Digital Soil pH Tester

If you want more than a basic soil pH tester, the YAMRON 7-in-1 offers a wide range of measurements in one handy device.

It checks soil moisture, pH, temperature and fertility, as well as light intensity. It also provides EC and TDS readings for water.

It’s a versatile mid-range option for gardeners who like to keep an eye on several growing conditions.

Key Features

The backlit LCD display makes readings easy to see, while the controls let you switch between measurement functions and choose Celsius or Fahrenheit.

The soil moisture reading uses a five-level percentage scale, while the fertility function gives a low, medium or high indication. Light intensity is displayed on a scale of up to 9,999 lux.

The pH scale runs from 3 to 9, covering acidic through to alkaline soil. I would treat these readings as general guides rather than precision measurements. The fertility percentage is also not a substitute for a laboratory soil test measuring individual nutrients such as nitrogen, phosphorus and potassium (NPK)

The EC and TDS functions are intended for water testing, making them potentially useful when checking irrigation water or nutrient solutions.

Using the Meter

Make sure the soil is reasonably moist and free from stones before testing. Select the required function, carefully insert the probes into the soil without forcing them, and allow the reading to settle. For a more representative picture of the area, take readings from several locations. When finished, wipe the probes clean and store the meter somewhere dry.

Size and Power

The meter measures approximately 12.6 × 2.4 × 1.6 inches (32 × 6 × 4 cm) and weighs around 4.6 oz (130 g), making it compact enough to store with your gardening tools. It requires four 1.5v AAA batteries, which are not included.

Warranty

I couldn’t confirm a standard manufacturer’s warranty period for the Yamron 7-in-1 digitail soil tester. Before buying, check the product information and the terms offered by the Amazon UK seller. Remember that Amazon’s returns policy is separate from any manufacturer’s warranty.

Is It Worth Buying?

The YAMRON is a useful all-round garden monitor, particularly if you want to check moisture, temperature and light as well as pH. Its multiple functions and backlit display are appealing at this price, but gardeners who need dependable, precise pH measurements may be better served by a dedicated soil pH meter.

Pro’s

Con’s

Price

Seven Measurement Functions
Backlit Digital Display
Soil pH and Moisture Readings
Additional Water Testing Functions
Compact and Portable
Celsius and Fahrenheit Display

Batteries not Included
Readings are General Guides
Fertility Reading Does not Replace NPK Testing
No Confirmed Manufacturer’s Warranty

Gain Express ZD-06 Soil pH and Moisture Meter

If you’re after a straightforward soil tester without batteries, complicated settings or calibration solutions, the Gain Express ZD-06 is worth considering.

It measures both soil pH and moisture, making it useful for checking vegetable beds, borders, lawns and even larger planters.

I particularly like its long, sturdy probe, which lets you take readings further down into the soil.

Gain Express ZD-06 Soil pH and Moisture Meter

Key Features

pH Readings and Accuracy. The ZD-06 measures soil pH from 3 to 8, covering the range most gardeners need. Gain Express quotes an accuracy of ±0.2 pH, which is reasonable for general garden use. There’s no digital screen; instead, you read the result from a simple analogue dial.

Soil Moisture Testing. Press the button on the side to check moisture levels on a scale of 1 to 8. It’s a handy extra if you’re unsure whether your plants need watering, although I’d treat it as a guide rather than an exact measurement of soil moisture.

Probe and Construction. The waterproof metal probe measures 11.6 inches (295 mm) long, making it particularly useful for deeper garden soil. The tester is approximately 16.1 inches (410 mm) long overall and weighs around 4.9 oz (140 g). You won’t need batteries, and there’s no separate electronic calibration to worry about.

Using and Caring for It. Push the probe into moist soil, avoiding stones and hard ground. Allow around five minutes for the pH reading to settle before checking the dial. Afterwards, wipe the probe clean and store it somewhere dry. The package includes the tester and an instruction manual.

What Do Other Reviewers Say? In independent testing by Bob Vila, the ZD-06 produced consistent readings close to laboratory results. Their soil sample measured pH 6.42 in the laboratory, while the tester gave readings between 6.2 and 6.4. They also praised the sturdy probe, although waiting several minutes for a reading was a drawback.

Warranty

One-year manufacturer’s warranty. Gain Express covers manufacturing defects for one year, excluding damage caused by misuse, accidents or neglect. Its website also offers a 30-day return arrangement, subject to its terms. If you’re buying through Amazon UK, check the seller’s warranty and returns conditions before ordering.

Conclusion

I’d recommend the Gain Express ZD-06 if you want a reliable-looking, battery-free tester for regular garden use. The long probe and additional moisture measurement are useful, and its performance in independent testing is encouraging. It’s less convenient if you want instant results, but for checking your soil now and again, I think it’s a sensible option.

Pro’s

Con’s

Price

No Batteries
Long, Sturdy Probe
Measures Moisture
Easy-to-Read Dial
Good independent results

Slow pH Readings
Limited pH Range
Ballpark Accuracy
Not for Liquids