The 8 Best Soil Testers

Updated May 06, 2018 by Ezra Glenn

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We spent 44 hours on research, videography, and editing, to review the top options for this wiki. Keeping your lawn green and your garden lush can be hard, especially if your soil is not in the best shape. Over time, dirt can become acidic or alkaline, too wet or too dry -- and all are bad news for your grass, flowers and veggies. With one of these testers, though, you can quickly find out exactly where you stand, so you can put together a plan of action to get things back on track. When users buy our independently chosen editorial picks, we may earn commissions to support our work. Skip to the best soil tester on Amazon.

8. Rapitest 1880

7. Kelway pHD

6. Gain Express

5. Dr. Meter S30

4. Luster Leaf 1605

3. Seekone 4 in 1

2. Bluelab pH Pen

1. Sonkir MS02

A Brief History Of Soil Testing

Ever since the Agricultural Revolution, humans have been obsessed with getting more production from their land. For most of recorded history, this meant rotating crops, slashing and burning fields, and adding compost or other fertilizers to the dirt and then hoping for the best.

About midway through the 19th century, however, scientists began to develop ways to analyze soil's potential before attempting to plant crops. This involved checking out samples of dirt and measuring their levels of key nutrients, such as phosphorous and potassium.

This new research coincided with the discovery and development of commercial fertilizers, led primarily by the work of German chemist Justus von Liebig. For the first time, scientists were learning exactly what nutrients were essential for plant growth, as well as how to ensure that those nutrients were properly absorbed.

The establishment of the Department of Agriculture in 1862, as well as the passage of the Morrill Act that same year, made the study of plant growth a priority in the United States. As a result, by the early 20th century, many newly-formed land grant universities picked up the soil testing mantle.

After the Dust Bowl ravaged American agriculture, the desire for improved crop fertility boomed. By the time the 1940s rolled around, there was enough understanding of the chemical processes that were essential to healthy plant life that yields took off, thanks in large part to improved commercial fertilizers and technologically-advanced farming equipment.

Today, farmers still bag up their soil and ship it off to the nearest agriculture college for study. However, there are also plenty of excellent soil testers available to gardeners and amateur green thumbs, and you can easily find kits that are able to provide all the information a home-based grower would ever need.

There's no telling what the future will hold for soil science, but many experts believe that the next breakthrough is right around the corner. Regardless, though, one thing remains certain: you won't be able to grow much of anything if you have bad dirt.

How To Get The Most Out Of Your Soil Tester

So, you've listened to the experts — whether those experts are professional landscapers or just the guy on your block with the lushest lawn — and you've gone out and bought yourself a soil tester.

Now what?

Well, before you even get started, you should know that this isn't a one-shot deal. To get the best results, you should test regularly, and in multiple areas, so that you build up a useful sample size. It's also important to track your results, as their change over time can give you important information about what's working — or not.

Make sure that your tester is clean every time you use it, as well. This means rinsing it off with distilled water and wiping it with a clean cloth after a test. Don't use tap water, as that can throw of the pH balance, and be sure you've completely removed any remnants of previous samples before testing, as that can also skew your results.

You'll want to dig down to root level to grab about a half inch of soil from each spot you want to test, then throw all of the samples in a large bucket to mix them. Wait for them to dry, as moisture can affect the readings (noticing a pattern yet?), and then use your tester as directed.

Write down all of the relevant information on a pad or in a journal, and keep the numbers in a safe place. You'll want to reference them the next time you test, which should be a little while after you take whatever corrective action your current readings suggest.

If everything goes well, you should see your numbers trend in a positive direction. Of course, if everything's going really well, you shouldn't need any numbers to spot the difference — it should be right there in front of your nose.

How To Fix Your Soil

If you find that your earth isn't up to snuff, fear not — there are ways to quickly fix it so that it becomes the equal of even the fanciest, most sophisticated dirt on the planet.

There are two main problems that most people will experience with their soil: either it's too acidic or too alkaline. This is determined by your pH levels, as anything below seven is considered acidic, and anything above is alkaline. Thus, your sweet spot is right in that neutral area around lucky number seven.

Acidic soil tends to be found in areas with lots of rainfall, and it's a breeding ground for weeds, but not for grass or veggies. You need something to cut the acidity, while also adding calcium and magnesium back into the soil. Limestone is usually just what the doctor ordered, as it's full of nutrients and does a great job balancing out acid levels.

Alkaline dirt, on the other hand, is common in dry areas. It can severely restrict a plant's ability to absorb nutrients, so if your green friends are withering away despite your best efforts, this could be why. Conditioners like gypsum or sulfur are generally recommended, or you could boost acid levels with peat moss or organic compost.

If you're trying to fix a large swath of vegetation — like, say, your entire lawn — then you'll probably need to rely on massive amounts of fertilizer. However, if you're only trying to boost the productivity of a small flower or vegetable garden, you may be able to build raised plant beds that you can fill with custom-blended soil, allowing you to skip a lot of the dirty work.

No matter what you're trying to grow, though, you'll need to make sure that your land can support it. Otherwise, you're wasting your time and throwing your money away — and nobody wants to hear a sob story about how you went broke investing in dirt.


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Last updated on May 06, 2018 by Ezra Glenn

Ezra is a writer, photographer, creative producer, designer, and record label-operator from New York City. He's traveled around the world and ended up back where he started, though he's constantly threatening to leave again.


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