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Hanna Instruments HI 98121 - Digital pH and ORP Meter

  • Hanna Instruments HI 98121 - Digital pH and ORP Meter
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Product Description

Our most popular digital pH and ORP tester.

  • Accurate pH and ORP Tester
  • LCD Display
  • Easy to Use

Important Note: This product must be purchased in conjunction with several calibration solutions for accurate testing.  Please read this entire page to get all the necessary details for using this exceptional meter!

The newest member to HANNA® Combo series of combination waterproof testers with advanced functions is HI 98121, designed for simultaneous pH and ORP measurements.

HI 98121 also reads temperature, which is continuously displayed on the dual level LCD.

An encapsulated external stainless steel sensor, positioned in close proximity to the pH electrode provides fast response. A fiber junction can be easily pulled out and replenished. And when finally spent, the pH electrode cartridge can be quickly replaced with the supplied electrode removal tool, reducing waste and cost.

HI 98121 works with common batteries and when turned on, displays the percentage of remaining battery life. The stability indicator ensures reliable readings.

Ergonomically designed for ease in handling, this meter will float if inadvertently dropped into water.


Range mV ±1000 mV
Range pH -2.00 to 16.00 pH
Range Temperature -5.0 to 60.0°C / 23.0 to 140.0°F
Resolution mV 1 mV
Resolution pH 0.01 pH
Resolution Temperature 0.1°C / 0.1°F
Accuracy mV ±2 mV
Accuracy pH ±0.05 pH
Accuracy Temperature ±0.5°C / ±1°F
Calibration mV factory calibrated
Calibration pH automatic, at 1 or 2 points with 2 sets of memorized buffers
(pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18)
Temperature Compensation   Automatic for pH readings
Electrode   HI 73127 replaceable pH electrode (included); fixed ORP sensor
Battery Type / Life   4 x 1.5V with BEPS / approx. 250 hours of continuous use;
auto-off after 8 minutes of non-use
Environment   -5 to 50°C (23 to 122°F); RH max 100%
Dimensions   163 x 40 x 26 mm (6.4 x 1.6 x 1.0")
Weight   100 g (3.5 oz.)

Users Manual:

Click here to read the users manual.

Frequently Asked Questions:

Click here to read some informative literature on the device.

You Will Also Need these Calibration Solutions:

ORP Pretreatment Solution ($14.99)
ORP Oxidizing Pretreatment Solution ($14.99)
pH 7.01 Buffer Solution ($11)
pH 4.01 Buffer Solution ($11)

A Video On Calibration Can Be Found Here:


Product Videos

Analytical Measurements: pHep 4 and pHep 5 Calibration (02:03)
Calibrating the pHep 4 and pHep 5 pH testers.
  • Analytical Mea...
    Calibrating the pHep 4 and pHep 5 pH testers.

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Product Reviews

  1. Good meter, get buffer solutions 5 Star Review

    Posted by on Oct 29th 2012

    I have never bought a pH meter before, but after looking around settled on this one. It works great and does exactly what I needed. I bought it for measuring urine and saliva pH. I took the advice of others and did make sure to buy the 4.01 and 7.01 Buffer solutions for calibrating.

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