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Hanna Instruments HI 991003 - Digital pH and ORP Meter

  • Hanna Instruments HI 991003N - Digital pH and ORP Meter
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Product Description

The most advanced and accurate pH and ORP meter we sell.

  • Large LCD Screen
  • Accurate pH and ORP Testing

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!

HI 991003N is a portable pH/pH-mV/ORP/temperature meter with our unique Sensor Check™ feature that allows the user to determine the electrode status at any time. HI 1297D pH probe feature a recessed flat tip that is easy to clean and prevents solids in solutions from collecting on the sensor. The titanium body of the probe functions as a potential matching pin for increased stability of readings and extended sensor life.

The HI 991003N easily fits in the palm of your hand and the bottom probe connection ensures the electrode cable doesn’t get in your way. The large, multi-level LCD displays the primary reading, temperature and calibration instructions simultaneously.

  • New Larger LCD
  • Tutorial messages for calibration and setup
  • Missing Probe Indicator
  • New Rugged, thinner ergonomic case
  • Faster/Easier battery replacement


  pH -2.00 to 16.00 pH
  pH-mV ±825 mV (pH-mV)
  ORP ±1999 mV
  Temperature -5.0 to 105.0°C; 23.0 to 221.0°F
  pH 0.01 pH
  mV 1mV
  Temperature 0.1°C/0.1°F
Accuracy (@20°C)    
  pH ±0.02 pH
  mV ±2mV
  Temperature ±0.5°C up to 60°C; ±1°C outside; ±1°F up to 140°F; ±2°F outside
Temperature Compensation   pH Automatic
pH Calibration   Automatic 1 or 2 point calibration with 2 sets of memorized buffers (4.01, 7.01, 10.01 or 4.01, 6.86, 9.18)
Electrode   HI 1297D pre-amplified pH/temperature electrode with DIN connector and 1 m (3.3’ cable)
Battery Type   (3) 1.2V AAA
Battery Life   Approximately 200 hours of continuous use
Auto-off   After 8 minutes of non-use
Environment   0 to 50°C (32 to 122°F); RH max. 100%
Dimensions   150 x 58 x 29 mm (5.9 x 2.8 x 1.1”)
Weight   205g (7.2 oz.)

Click here to read some additional informative literature on this 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:


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