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Hanna Instruments HI 98121 Combination pH/ORP/Temperature Tester
|Price:||$199.99 & FREE Shipping. Details|
|You Save:||$24.89 (11%)|
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Specifications for this item
|Brand Name||Hanna Instruments|
|Part Number||HI 98121|
|Number of Items||1|
|EAN||0000099908805 , 0837654243831 , 0798527602240|
|Inside Depth||6.4 inches|
|Item Weight||3.52 ounces|
|Measurement Type||pH , Temperature|
|Range||-2 to 16 pH|
|Size||With Two Sets of Memorized Buffers|
|UPC||837654243831 , 798527602240 , 000099908805|
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The HI 98121 pH/ORP/Temperature Tester is a waterproof combination pocket pH, Oxidation Reduction Potential (ORP), and temperature tester with a replaceable electrode and a non-clogging, replenishable fiber junction.
The meter features a large LCD screen for readability, an ergonomically designed waterproof casing, and automatic temperature compensation to eliminate the need for additional calculations. It has a replaceable electrode and renewable reference junction, which helps prolong the life of the tester.
The HI 98121 tester functions in temperatures of -5.0 to 60.0 degrees C/23.0 to 140.0 degrees F (+ or - 0.1 degrees C / 0.1 degrees F), and has a range of -2.00 to 16.00 pH (+ or - 0.05) with a resolution of 0.01 pH. The meter can be calibrated at one or two points for pH with auto-buffer recognition, and against five memorized buffer values. For ORP (Oxidation Reduction Potential) readings, the tester has a range of + or - 1000mV (+ or - 2) with a resolution of 1mV and automatic factory set calibration. Dimensions are 163 x 40 x 26 mm (6.4 x 1.6 x 1.0"), with weight 100 g (3.5 oz.).
pH testers measure the acidity or alkalinity of a substance and are commonly used by researchers, manufacturers, and hobbyists.
Hanna Instruments manufactures a wide variety of analytical instrumentation, including pH meters, multi-parameter meters, electrodes, chemical reagents, and buffer solutions. Founded in 1978, Hanna is headquartered in Woonsocket, RI, with subsidiaries in 32 countries. Hanna Instruments holds many firsts in the field of analytical instrumentation, including a pH electrode with a built-in temperature sensor, an electronic pocket-sized pH tester, and a replaceable electrode pH pocket tester. To ensure the quality of its products, Hanna is a vertically integrated manufacturer and does not subcontract any part of its manufacturing.
What’s in the Box?
- Protective cap
- Calibration screwdriver
- Four 1.5V batteries
Top Customer Reviews
TIP: If you haven't used it in a long time...just soak it in some 2.5 acid water overnight.
TIP: If doing demo's and it seems to not be adjusting to orp fast enough...run some 11.5 and 2.5 in two cups. Then put meter in one cup then the other for 20 secs or so each, keep going back and forth till it starts registering orp faster. Once satisfied put a little 2.5 in the cap and close...no you're ready! I do this before EVERY demo...it helps the unit register a lot faster.
Edward PaquetteHanna Instruments HI 98121 pH/ORP/Temperature Tester
As others have found, the storage solution shipped in the cap had dried up. I was unable to get the pH reading to stay in calibration and the ORP function gave erratic results. So I exchanged it for another of the same model.
The replacement meter had exactly the same problems. The instructions say to soak it for one hour in HI 70300 storage solution if the pH electrode had dried out. However, I had to soak it for 4 days before the pH reading would stay in calibration.
The ORP function was still somewhat erratic, went way down if the solution was stirred, and took as long as 90 minutes to settle to a stable value. The instructions recommend soaking in HI 7061 cleaning solution to clean the electrodes, but that did not help. Hanna also recommends polishing the ORP electrode with jeweler’s rouge, but that did not help either. Some other manufacturers recommend polishing the platinum ORP electrode with baking soda. I gently polished the platinum ORP electrode several times with baking soda on a moistened Q-tip and it worked! The ORP function now gives a stable reading in 2 to 4 minutes. (Do not polish the glass pH electrode.)
Since both meters I tried arrived dried up, I suspect the initial problems may have been due to old stock or improper storage rather than a manufacturing defect. I have read that pH electrodes have limited lifetime, even in storage, so I would try to find a source of fresh stock if I bought again.Read more ›
Most Recent Customer Reviews
Used this on a jobsite, and it works ok, but I'm not confident in its accuracy as I would get different readings and it would never seem to settle on a value.Published 8 months ago by Amazon Customer
Great lil gadget ... Best, most durable PH / ORP tester on the market, for the price...Published 10 months ago by John Chapple