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Hanna Instruments HI-991003 portable pH/ORP/°C meter


Designed specifically for use in manufacturing and environmental testing protocols

SKU: HI-991003 Category:


The HI-991003 pH/ORP Meter is designed specifically for use in manufacturing and environmental testing protocols. The specialized probe features a titanium body, integrated temperature sensor, and cloth junction.

  • ±0.02 pH accuracy; ±1 mV ORP accuracy
  • Comes with all the necessary solutions and batteries- everything you need to get started measuring right away.
  • Specialized for direct pH and ORP measurement.

Probe Condition

An on-screen indicator provides visual confirmation that your probe is working at its best.

Low Battery Indicator

The included batteries provide 1400 hours of continuous use. When the battery level is below 10%, a warning symbol will blink to indicate low battery condition. When low battery power may affect your results, the meter will shut down to avoid erroneous readings caused by low battery level.

Automatic Shut-off

The auto-off feature can be set to shut the meter off at 8 or 60 minutes, or it can be disabled so that the meter continuously stays on. The auto-off feature prolongs battery life for peace-of-mind and energy savings if the meter is accidentally left on.

Built to be Durable

Designed to withstand the knocks, drops, and spills of real life, the new IP67 body ensures top performance in any environment. These meters are protected against dust and water intrusion from any direction.

Portable Design

Made to fit comfortably in your hand for on-the-go testing, the multilevel LCD display provides at-a-glance readings of pH, ORP, and temperature from any angle and dual button operation streamlines the testing process for any user.

Quick Connect Probe

A Quick Connect DIN connector makes attaching and removing the probe simple and easy. The rubber coating protects the cable and provides a water-tight seal without twisting.

Ordering Information:

Each meter is supplied complete with: • HI-12973 pH/ORP/temperature probe with titanium body and DIN connector with 1m (3.3’) cable • pH 4.01 & 7.01 Buffer sachet • HI-700601 Electrode general cleaning solution (2 sachets) • 100 mL beaker (1 pcs.) • Alkaline batteries: 1.5V AAA (3 pcs.) • Rugged carrying case • Calibration certificate of meter • Calibration certificate of probe • Instruction manual


Accuracy mV ±2 mV
Accuracy pH ±0.02 pH
Accuracy pH-mV ±1 mV
Accuracy Temperature ±0.5°C (up to 60°C), ±1°C (outside); ±1.0°F (up to 140°F), ±2°F (outside)
Battery Type / Life 3 x 1.5V AA / approx. 1500 hours of continuous use^ auto-off after 8 minutes of non-use
Electrode HI12973 pH/ORP/temperature probe with titanium body and DIN connector with 1m (3.3’) cable
Environment 0 to 50°C (32 to 122°F); RH max 100
pH Calibration automatic, at one or two points with two sets of standard buffers (pH 4.01 / 7.01 / 10.01 or pH 4.01 / 6.86 / 9.18)
Range mV ±1999 mV
Range pH -2.00 to 16.00 pH
Range pH-mV ±825 mV
Range Temperature -5.0 to 105.0°C / 23.0 to 221.0°F
Resolution mV 1 mV
Resolution pH 0.01 pH
Resolution pH-mV 1 mV
Resolution Temperature 0.1°C / 0.1°F
Temperature Compensation Automatic, -5 to 105°C (23 to 221°F)
Weight 196 g (6.91 oz.)
Warranty 2 years (probe 6 months)



Additional information

Weight 0,196 kg