| | |  | Single Gear / Wheatgrass Juicers | Home » » Hanna Insturements HI98120 ORP/Temperature Meter +/-1000 mV | | | | | | | Description: | | The HANNA HI 98120 is an advanced function, micro-processor driven ORP tester designed to measure ORP levels up to =/- 1000 mV. It is compact, easy to use, empoys a dual-level LCD, a waterproof body, and will float if dropped in water. The HI 98120 ORP electrode is provided with a pull-out cloth junction that is easily replaced. The encapsulated stainless steel temperature sensor is fast and responsive. Factory calibration and the new stability indicator ensures reliable readings. The HI 98120 is powered by commonly available batteries. The LCD indicater displays the percentage of remaining battery life. This meter is Ergonomically designed for ease of use and a long | | | Features: | |
• Range mV +/-1000 mV ; Temperature -5.0 to 60.0 Deg C / 23.0 to 140.0 Deg F
• Resolution mV 1 mV; Resolution Temperature 0.1 Deg C / 0.1 Deg F
• Accuracy mV +/- 2 mV ; Temperature +/- 0.5 Deg C / +/- 1 Deg F; factory calibrated
• HI 73120 replaceable ORP electrode included; 4 x 1.5V with BEPS / approx. 300 hours of continuous us
• Manufacturers 1 Year Limited Warranty
| | | Product Details: | | | Product Length:
| 6.4 inches | | Product Width:
| 1.6 inches | | Product Height:
| 1.0 inches | | Average Customer Rating:
|  based on 1 reviews |
| | | | Customer Reviews: | |
Average Customer Review:
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Most Helpful Customer Reviews
Measuring ORP, hope you were not in a hurry!Dec 30, 2011
By Martin C. Michener
This instrument has been reliable and easy to use, and this review is more about the MEASURING of environmental ORP, than any reflection on Hanna Instruments. To measure the ORP of a stream, pond or well-water, just pop the cap off, rinse the tip off. Place the sample in a shot glass, (not for liquor but for amusement). The weight and size of a shot-glass holds about 25 ml of sample fluid, and on a flat level surface (truck tailgate)is weighted to hold the ORP meter standing upright. But why does the reading keep drifting one millevolt every minute . . . for 90 minutes?
Background: ORP is not a well-defined aquatic parameter, as is pH, the log of the hydrion concentration. ORP is the sum of all chemical species in solution tendency to remove electrons. In large positive value solutions, things get oxidized--electrons removed, organics often literally into Carbon Dioxide, halides or acid salts, CO3-2, SO4-2, etc. In more rarely encountered reducing solutions with negative ORP values, compounds get reduced, receiving electrons, salts, sulfides and oxides converted back to metals. Positive values are simply more common because we live in an oxygen-rich environment. Beyond those defining statements, ORP is quite mysterious.
In real-life waters, and the muddy results of shaking distilled water with soils, ORP is vastly complex, because on tiny suspended clay particles, like most large proteins, there are multiple chemical sites which both accept and dissociate into ions and electrons. Also, the dissolved Oxygen often slowly decreases as the measurement is being taken. Unlike pH measurements, well-buffered soil suspensions may drift for many minutes, despite stirring, due to these processes. For that reason, as a standard practice I stop moving the probe and wait for reading to stabilize--often for more than an hour. Expect hysteresis (voltage carry-over between samples) and follow the James Bond Dry Martini rule for each soil sample: shaken, not stirred.
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