Hanna Instruments HI991003 Water-resistant portable pH / mV / ORP meter

HI991003 Water-resistant portable pH / mV / ORP meter

Article number: HI991003
Availability: Out of stock
Delivery time: Delivery time on request
Designed to bring simplicity to pH testing, the HI991003 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.


Specifications HI991003

pH Range

-2.00 to 16.00 pH

pH Resolution

0.01 pH

pH Accuracy (@25ºC/77ºF)

±0.02 pH

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)

mV Range

±1999 mV

mV Resolution

1 mV

mV Accuracy

±2 mV

pH-mV Range

±825 mV (pH-mV)

pH-mV Resolution

1 mV

pH-mV Accuracy

±1 mV

Temperature Range

-5.0 to 105.0°C / 23.0 to 221.0°F

Temperature Resolution

0.1°C / 0.1°F

Temperature Accuracy (@25ºC/77ºF)

±0.5°C (up to 60°C); ±1.0°C (outside) / ±1°F (up to 140°F); ±2.0°F (outside)

Temperature Compensation

automatic from -5.0 to 105.0ºC (23 to 221ºF)


HI1297D pre-amplified pH/ORP probe with internal temperature sensor, DIN connector and 1 m (3.3’) cable (included)

Battery Type/Life

1.5V (3) AAA / approximately 1200 hours of continuous use; auto-off after 8 minutes of non-use


0 to 50°C (32 to 122°F); RH max 100%


152 x 58 x 30 mm (6.0 x 2.3 x 1.2”)


205 g (7.2 oz.)

Ordering Information

HI991003 is supplied with HI1297D pH/ORP probe with internal temperature sensor, HI70004 pH 4.01 buffer sachet (20 mL), HI70007 pH 7.01 buffer sachet (20 mL), HI700661 electrode cleaning solution sachet (2 x 20 mL), batteries, instructions, and rugged carrying case.


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