Updated May 12, 2019 by Quincy Miller

The 10 Best Soil Testers

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Best Inexpensive

This wiki has been updated 17 times since it was first published in March of 2017. Keeping your lawn green and your garden lush can be hard, especially if the 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 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 in a hurry. When users buy our independently chosen editorial choices, we may earn commissions to help fund the Wiki. Skip to the best soil tester on Amazon.

10. Luster Leaf 1880

9. Kelway pHD

8. Luster Leaf 1605

7. Gain Express

6. Bluelab pH Pen

5. Sonkir MS-X1

4. LinTimes 3-in-1

3. Xlux Indoor/Outdoor

2. Sonkir MS02

1. Soil Savvy

Special Honors

Solum Soil Testing Designed for farmers, Solum is likely too pricey — not to mention being overkill — for the average homeowner. However, professionals may want to keep it in mind, as well as those green thumbs who are willing to go above and beyond for their plants. Solum

MicroBiometer 10 Test Starter Kit This kit includes extraction vials, reaction agents, and anything else you might need to reveal the secrets hidden in your soil. Best of all, it delivers its analysis directly to your smartphone in as little as 10 minutes. MicroBiometer

Harris Seeds Professional You can enjoy the accuracy of a professional lab without the waiting time or postage fees, thanks to this kit. It allows you to run as many as three tests simultaneously, and checks on everything from phosphorous to potassium levels. Harris Seeds

Editor's Notes

May 10, 2019:

Soil Savvy is the most exact option on this list, as it subjects your dirt to expert analysis in a professional lab. It's a kit that's worth using every year, even in conjunction with other options listed here. It's not ideal for snapshots of your ground's health, but it can give you a bird's-eye view of how successful your dirt rehabilitation efforts have been year over year.

The Sonkir MS02, on the other hand, is perfect for carrying with you every day as you putter around the garden. It's quick, reliable, and cheap, giving you most of the information you need in just a few seconds. Consider pairing it with the Soil Savvy to cover all your bases.

We almost didn't include the Kelway pHD in this edition, as it's a relatively expensive single-function model. However, mismanaged pH levels can wreak havoc on your lawn, so it's worth plunking down a few extra bucks for a device that will give you the most reliable readings possible. Again, though, don't expect it to provide you with all the data you'll need to make informed choices about your lawn care.

A Brief History Of Soil Testing

About midway through the 19th century, however, scientists began to develop ways to analyze soil's potential before attempting to plant crops.

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.

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.

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.

This is determined by your pH levels, as anything below seven is considered acidic, and anything above is alkaline.

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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Quincy Miller
Last updated on May 12, 2019 by Quincy Miller

After getting his bachelor’s from the University of Texas, Quincy Miller moved out to Los Angeles, where he soon found work as a copywriter and researcher, specializing in health and wellness topics for a major online media brand. Quincy is also knowledgeable about home improvement, as he’s had extensive experience with everything from insulation to power tools to emergency room trips, sometimes in that order. Sharing a home with three dogs and a couple of cats has forced Quincy to learn as much as he can about pet supplies, animal nutrition and, most importantly, the best ways to tackle the mountains of fur that accumulate in every corner of your home.

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