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  • Luster Leaf 1840 Rapitest Soil pH Meter
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Luster Leaf 1840 Rapitest Soil pH Meter


List Price: $21.99
Price: $15.25 & FREE Shipping on orders over $35. Details
You Save: $6.74 (31%)
Only 17 left in stock (more on the way).
Ships from and sold by Amazon.com. Gift-wrap available.
  • Product specifically designed to be used only in soil
  • Automatically measures soil pH
  • No chemicals or litmus paper required
  • Information included for how to test
  • No batteries required
52 new from $9.77 1 used from $14.49

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Frequently Bought Together

Luster Leaf 1840 Rapitest Soil pH Meter + Luster Leaf 1820 Rapitest Soil Moisture Meter + Luster Leaf 1601 Rapitest Soil Test Kit
Price for all three: $41.77

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Special Offers and Product Promotions

  • Buy Used and Save: Buy a Used "Luster Leaf 1840 Rapitest Soil pH Meter" and save 34% off the $21.99 list price. Buy with confidence as the condition of this item and its timely delivery are guaranteed under the "Amazon A-to-z Guarantee". See all Used offers.

Product Details

  • Product Dimensions: 1.9 x 5.3 x 11.5 inches
  • Shipping Weight: 1 pounds (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • ASIN: B0000DI848
  • Item model number: 1840
  • Average Customer Review: 2.9 out of 5 stars  See all reviews (96 customer reviews)
  • Amazon Best Sellers Rank: #1,640 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)

Product Description

From the Manufacturer

Luster Leaf 1840 Rapitest Soil pH Meter

Product Description

Test soil pH to ensure your plants are in the proper soil to provide ideal growth. This meter with tethered stainless steel probe provides instant readings of soils acidity or alkalinity. No chemicals or litmus paper required. Information included for how to test, balance and control soil pH levels. No batteries required for operation.


Customer Questions & Answers

Customer Reviews

Clean it with fine steel wool before using and follow the provided directions and it works fine.
opinions
The meter seems to be ultra-sensitive...you must clean the metal probe, not the tip, with the included green pad before each insertion into the soil.
Joycee
I tried testing pure white vinegar and the reading showed it was pH 7 (it should have been around 2).
David Stoddard

Most Helpful Customer Reviews

117 of 118 people found the following review helpful By Eric Spry on June 25, 2009
I bought one of these meters in 1987 (obviously not from here!) and am still using it today. I've had the same 'problem' other people have reported about the meter staying at 7, but it's easy to solve.
I use a small piece of 600 grit sandpaper to polish the probe prior to use. The readings are accurate every time. Just make sure the probe is bright and shiny (especially the tip), and it will work. If it's not shiny, the readings will be sporadic, or it will just get stuck on a particular reading. It's a very simple and affordable PH meter, that can obviously last a very long time!
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191 of 198 people found the following review helpful By N.C. on January 7, 2009
I purchased this meter about 2yrs. ago and it works fine. I think what the other neg. reviewers are failing to do even on brand new meters is to keep the probe clean, not just visually clean. These work off a chemical and electrical reaction if the probe has any oxidation which starts the minute after you clean the probe it varies or even blocks the electron flow, distorting or even blocking the reading entirely. With mine before I go to use it I pinch a peice of steel wool in my fingers and run it back and forth a couple times than wipe it clean. Do this and you'll find very acurate and subtle changes in readings. You also don't need to do all the soil prep as one reviewer said. Just collect and test watering run off from potted plants. If you want to test straight soil, yes the soil must be moist and you'll learn to make the slight needed adjustments in readings with practice, no big deal. Keep in mind salt water conducts electricity better than fresh, it's nearly the same principle as to why the directions what you to test mixed and dissolved soil. I did this once for acuracy and than acounted for the diffrence when I test straight into the potted soil with no prep. Do wipe probes inbetween test and maintain consistent probe depth. (Duh the more metal that's in contact with the test medium soil/water the greater the flow of electrons will be and to the meter, effecting it.) I test my watering solutions and it is acurate enough that if the water is wavey hitting the probe at different hights the meter reads these subtle diffrences. In short great product especially under $15, you just have to be smarter than the meter.
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37 of 38 people found the following review helpful By Michele on May 8, 2009
Verified Purchase
This product works great. I was reluctant to buy it because others said it just keeps showing 7, but if you follow instructions and make sure the soil is wet, it works perfect. Be careful not to stick it in dirt that has a lot of rocks or you will scratch it.
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27 of 27 people found the following review helpful By Chuck2 on October 2, 2010
Verified Purchase
The tester worked good after I found the best way to use it. I got readings of 5.6 to 6.8 around different plants (mostly azaleas). What worked best for me was to clear a small 4 to 6" area of exposed soil. The soil needs to be damp down 4-5". I pressed the area down so it was firm. I then pressed the probe in all the way to the black frame (4-5") and then turned it some per directions. The probe should go in smoothly without hitting anything (stones) and it should feel tight - like the soil is firmly around the probe. It may take a minute for the needle to settle out. You can do 2 to 3 probes at adjacent locations. You need to clean the probe with the supplied little pad like the directions say when you go to a new plant/location.
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23 of 24 people found the following review helpful By Consumer on May 9, 2011
Verified Purchase
Well, I read all the reviews and bought anyways figuring people just didn't know how to follow instructions or how to properly clean the probe.

I tried damp soil, soil test while raining outside, soil mixed with distilled water... always a 7. I used the provided cleaning pad and cleaned vigorously, yet still careful to avoid the tip. I used the probe gently and everything stayed intact. Yet the meter only ever read 7.

Finally I tried cleaning it again, then sticking it into orange juice (documented pH of 4 +- 0.5). The needle moved very slightly to about 6.8 over the course of 30 seconds, then stayed there. The metal part remains smooth and shiny.

Seeing as how the instructions only say to "gently" clean the metal part, and how returning was looking like a better option, I didn't try the sandpaper approach.

THEN: I gave it one last try with some steel wool... and behold... IT WORKS! The provided cleaning pad is GARBAGE! You need something more abrasive. I still need to test the accuracy however.
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36 of 41 people found the following review helpful By Alastair Halliday on March 25, 2010
Doesn't work right out of the box.

Yes, I followed every detailed instruction. I completely cleaned the probe. I even went out and purchased distilled water for the soil sample. I paid attention to every review here and elsewhere and it's clear that this company sells two versions of this product:

One that works (about 40%)
One that doesn't work (about 60%)

I'm not usually a gambling man, but for whatever reason I was convinced that I was going to purchase a version that worked. It didn't. I had a similar experience to others where it reads at something like 6.9 regardless of what you stick it in. I did the process several times, cleaning it several times, multiple soil samples, using the glass method and in the soil method it never changed the position of the needle. Really horrible quality control.
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16 of 17 people found the following review helpful By Paul Charlesworth on March 24, 2010
As NC points out, you need to use this correctly. I have used this pH meter along side the test kits and find it gives you a quicker reading that is on-par with the Rapitest kits that are not exactly sophisticated. The Rapitest kits such as 1612 give you half point precision, which is pretty much what I get with this. Like anything, you need to know your instrument, which must be clean and polished, and you need to have the right soil moisture. That moisture needs to come from distilled or deionized water if yours has a distinct pH. A lot of the time you cannot go sticking this straight in the soil because the moisture is often incorrect or you could hit objects.

Is it perfect? Of course not, but it is costs under $20. The pH meters we use in laboratories cost 10-20 times this little gadget.
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