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Hanna Instruments HI 99121 Direct Soil pH Meter

2.5 out of 5 stars 2 customer reviews

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1 new from $882.60

Specifications for this item
Brand Name Hanna Instruments
Part Number HI99121
Number of Items 1
Inside Depth 5.9  inches
Item Weight 7.36 ounces
Measurement Type pH , Oxidation Reduction Potential (ORP) , Temperature
Style Name Portable
UNSPSC Code 41115603

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Product Features

  • Special pH probe for soil pH
  • Auto shut-off
  • automatic temperature
  • easy to calibrate
  • 1500 battery life

Product Description

The HI99121 was designed to specifically work for pH and temperature analysis of water and soil. The special HI1292D electrode is designed with a spherical tip to allow it to pentrate into soil . This is a popular meter for growers and landscapers. The electrode is made of glass so basic care is recommended. The pH range is -2.00 - 16.00 pH. Temperature range is Temp range is 23.0 - 220 0F

Product Details

  • Product Dimensions: 50 x 50 x 50 inches ; 7.4 ounces
  • Shipping Weight: 3.6 pounds
  • Domestic Shipping: Item can be shipped within U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B002NX0VYW
  • Item model number: HI99121
  • Average Customer Review: 2.5 out of 5 stars  See all reviews (2 customer reviews)
  • Amazon Best Sellers Rank: #244,744 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • Product Warranty: For warranty information about this product, please click here

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Top Customer Reviews

By P. Conner on December 3, 2010
I bought this in the hopes of having a quick reliable way of measuring soil pH quickly without having to guess the color of pH strips. Sounds like a good deal, and certainly costs enough, but its just a bad product. First of all, it comes with very sketchy manuals. The one that comes with for the electrode especially is a joke. Its a general purpose manual that looks like it is trying to fit every electrode they make. none of the images show this electrode nor is any of the care information specific to the electrode. This is a refillable electrode, want to refill it? Sorry, you'll need to buy that solution separately once you go online to figure out what solution you need (the manual gives you a choice of 2, and you have to try and figure out which electrode you have). Want to store your electrode in the proper storage solution as recommended? Sorry you'll have to buy that solution separately as well, you don't even get a sample pack.

I maybe used it a few times and it seemed to work OK. Then I stored it a few months and the next time I tried it everything now reads 7.0. Try to calibrate it and it won't accept the pH 4.0 buffer. My guess is the electrode is broken. $139.00 to buy a new electrode. I didn't do anything other than stick it in the soft ground that I know of. I think I'll pass and chalk this one up as a mistake.
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This unit does have it's limitations, as do most soil instruments. I bought this for a work project to measure the pH of soil treated with multiple different additives. Now keep in mind, most pH indicators that can be used insitu (in the ground without any preparation) will only read reliably up to about 9 or 10 pH and likely don't read much below 5. If you're looking for a reader within those parameters, go with something else; this unit is likely not your best option. If you are looking at more of the extreme levels of pH in the soil without doing any prep work (i.e. drying, diluting, making a slurry, etc) this is the only meter I've found that will accomplish this.

It is very fragile and a bit finicky, so be sure you read the instructions thoroughly and call their help line if you have any issues. And always use the storage and calibration solution. If this sounds too complicated, this is not the tool you want to purchase. If you feel comfortable using a scientific piece of equipment properly, this unit should work out well.

And the costumer service was fantastic. I had my first node short out (which is fairly common), but it fell under the warranty, so no problem. I also broke a node on a small rock...learned my lesson to use very little pressure when putting it in the ground.
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