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Hanna Combo pH/EC/TDS/C/PPM Tester HI98129

3.4 out of 5 stars 90 customer reviews
| 11 answered questions

Price: $156.99 & FREE Shipping. Details
Only 10 left in stock.
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Specifications for this item
Brand Name Hanna Instruments
Color Black
EAN 0787461659175 , 0793573622419 , 0799331544443 , 5053184545428
Item Weight 2.88 ounces
Measurement Type pH , Temperature
Number of Items 1
Part Number HI 98129
Style Name Portable
UNSPSC Code 42181904
UPC 799331544443 , 793573622419 , 787461659175


Frequently Bought Together

  • Hanna Combo pH/EC/TDS/C/PPM Tester HI98129
  • +
  • General Hydroponics Ph 4.01 & Ph 7.0 Calibration Solution Kit, 1 pint
Total price: $173.28
Buy the selected items together

Product Features

  • Automatic calibration at one or two points with two sets of memorized buffer values for ease of use
  • Replaceable electrodes to prolong life of meter
  • Automatic temperature compensation (ATC) eliminates need for extra calculations
  • Waterproof and floats in water
  • Automatic shut-off to extend battery life

Product Description

The Hanna Instruments HI 98129 is a multi-parameter tester that measures pH, electro-conductivity (EC), total dissolved solids (TDS), and temperature, and features automatic temperature compensation (ATC), an LCD screen, automatic shut-off, and a waterproof body that floats in water. The tester automatically compensates for the effects of temperature when taking pH and EC/TDS readings, so additional measurements and manual temperature entries are unnecessary.

The HI 98129 meter has a replaceable pH electrode with an extendable cloth junction, and an EC/TDS graphite electrode that is resistant to salts and other corrosives. These features extend the life of the meter by allowing for replacement of the electrodes. Calibration is automatic at one or two points, with two sets of memorized buffer values (pH 4.01/7.01/10.01 or 4.01/6.86/9.18). The EC/TDS conversion factor and temperature compensation coefficient (&Beta) is user-selectable.

The tester functions in temperatures of 0.0 to 60.0 degrees C/32.0 to 140.0 degrees F (+ or - 0.5 degrees C/1 degree F), and has a range of pH 0.0 to 14.0 (+ or - 0.05 pH). EC range is 0 to 3999 uS/cm, TDS range is 0 to 2000 ppm (+ or - 2% F.S), with respective resolutions 1 uS/cm and 1 ppm. At 3.5 ounces and 8.3 x 2.7 x 1.3 inches (H x W x D), the HI 98129 is sized for taking measurements in the field. (H is height, the vertical distance from lowest to highest point; W is width, the horizontal distance from left to right; D is depth, the horizontal distance from front to back.)

pH testers measure the acidity or alkalinity of a substance and are commonly used by researchers, manufacturers, and hobbyists.

Hanna Instruments manufactures analytical instrumentation and supplies, including pH meters, electrodes, chemical reagents, and buffer solutions. The company, founded in 1978 and headquartered in Woonsocket, RI, meets International Organization for Standardization (ISO) 9001 standards.

What’s in the Box?

  • HI 98129 meter
  • Protective cap
  • Electrode removal tool
  • Four 1.5V batteries
  • Instructions


Product Details

User Manual [277kb PDF]
  • Product Dimensions: 8.4 x 2.7 x 1.3 inches ; 2.9 ounces
  • Shipping Weight: 5.6 ounces (View shipping rates and policies)
  • Domestic Shipping: Currently, item can be shipped only within the U.S. and to APO/FPO addresses. For APO/FPO shipments, please check with the manufacturer regarding warranty and support issues.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • ASIN: B002ZG8L58
  • Item model number: HI98129
  • Average Customer Review: 3.4 out of 5 stars  See all reviews (90 customer reviews)
  • Amazon Best Sellers Rank: #37,713 in Industrial & Scientific (See Top 100 in Industrial & Scientific)
  • Product Warranty: For warranty information about this product, please click here

Customer Questions & Answers

Customer Reviews

Top Customer Reviews

I have used this meter for about 4 years for hydroponic gardening (hobby level). I have recently been using the meter to test the water and adjust pH and fertilizer in my kitchen Aerogarden. It's easy to use and accurate for this use, and has made a big difference in the quality and quantity of my gardening results.
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After receiving this item I tested it out for about an hour and quickly made the decision to return it(mainly due to the fact that it was defective, would not give me a ppm reading.). As other reviewers have stated, it takes awhile to stabilize its readings and does not seem hold calibration well. When I went back to test the same water sample I got a one point differential in the previous reading. First ph reading was 8.1 which I knew was not accurate. Just before attempting to calibrate I tested the same sample again and got a ph reading of 7.4. After calibration I got a reading of 7.1. Three different readings from the same sample. I've seen similar products from bluelab sell for over $200 and have stellar customer reviews. In the end I guess you get what you pay for.

Also I would check out a four star review posted by orion as he explained perfectly why It may not be the best option for you if you plan to use it as an ec meter.
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This is the second example I bought, and it's not working well. The pH sensor is functioning OK, but the conductivity one in about 30-40% of cases displays false low readings.

Ah, also - this type eats the batteries like there is no tomorrow. My old Oaktons used to run of the same set of batteries for 6-8 months, while this unit drops 1-2% of battery power every day ... which means the expensive batteries will have to be replaced every 2 months.

Among the advantages (arguably): easier to calibrate than most other pocket conductivity meters. But, these HAVE to use certain calibration solutions, specifically 1,413 uS. So, if you don't happen to have 1,413 uS only, don't even try with your 3,900 uS or whatever else you may have.
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I purchased my first Hanna combo meter 10 yrs ago and it was awesome. Then a couple years ago when it finally broke I replaced it. The second meter needed a new electrode after just a couple months. Then it failed entirely. My third meter lasted around 7 months and then it had the same problem with the ph electrode (the ppm seems fine, it has always been the ph electrode that fails on mine). I spoke with the manager at my local hydro shop and they said I am not the only one experiencing these problems. Hanna use to allow the hydro shops to swap out the meters if it was within the warranty period. They no longer do this. Now you have to contact Hanna directly and pay to ship it back and forth, only to be told the electrode will be replaced at your expense. The quality of the meter and customer service has declined. Not sure if it is true, but I was told the electrodes use to be made from hand blown glass and ever since they switched their manufacturing process they have turned to junk. I personally switched to a bluelab ph pen. I haven't had it long but so far it works (except it only goes to the tenth instead of hundredth decimal point).
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I got the tds meter in package and it works great. Turns on real quick measures good. Takes a lil bit as far as the tds counting and ph counting. but it is very accurate within .01 accuracy...Very good quality. I was pricing a tds meter and a ph meter waterproof and temp meters. And its to much hassle to fanagle with different meters....At the end of it all, i only save 10 20 bucks...Meaning..THIS thing has it all in 1 shot, Worth the extra few bucks. Waterproof, tds, ph and temperature all in 1...Can't beat it... Good quality, u can just let it float in the water. The manual says to clean the tip of it after using to make the meter last longer. So thats what i do
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I have the exact same problem as one of the other reviewers so I'm just going to repost:

"[...] did not hold calibration between on / off cycle. After being calibrated using 4.01 and 7.01 buffer solutions and turned off and back on, PH readings were off by .40 to .50. In other words the previously calibrated 7.01 buffer solution would read 7.40 to 7.50. This is way more than the advertised accuracy of + or - .05."

I also made a test where I inserted the meter in the 4.01 pH buffer and I did NOT remove the meter from the solution when the small clock disappeared (which signals that the reading is stable). The reading went slowly from 3.97 to 4.39, without me changing anything.

The electrode takes a very very long time to stabilize its reading.
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Ok, this is the 2nd Hanna combo pen I have owned. I have been a professional hydroponic grower for over ten years. I consider this one of the best all in one pen's that you can get. With that said....I had to return my first one as it did not work at all! You couldn't even calibrate it. The return process was very easy, and amazon quickly sent out a replacement. So far so good with the replacement, although I am still suspicious that this is not a real Hanna pen and could be a knockoff. I intend to contact Hanna to check, and will update if necessary. The only other reason I can think of why the original pen didn't work would be that these do not come with ANY storage lubrication as they should. Even my second one was dry as a bone upon arrival and will most certainly affect the life of the pen. No PH meter should EVER be sent with-ought storage solution keeping the electrode safe and usable. All and all I wouldn't risk the purchase. I need this for work and don't have the time to return it again, and my local store is out of stock so i'm stuck. If you buy this make sure you test and recalibrate the ph every week.
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