Waterproof Portable pH/pH-mV/ORP/Temperature Meter with Sensor Check™ - HI991003

SKU: HI991003

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The HI991003 is a compact, waterproof, portable pH/pH-mV/ORP/temperature meter that is supplied complete including a rugged carrying case and a unique titanium body pH/ORP electrode that has a built-in temperature sensor. This meter comes with our unique Sensor Check™ feature that allows the user to determine the electrode status at any time. The meter features a large, dual level LCD display for easy viewing of the pH, pH-mV, ORP, temperature, and status indicators. The operation of the meter is simplified to two buttons. The HI991003 has an exceptional long battery life of 1400 hours of continuous use.

  • Automatic Temperature Compensation
  • Automatic Two-Point Calibration
  • Waterproof

The HI991003 meter features a large multi level LCD screen which displays both pH/pH-mV/ORP and temperature readings simultaneously with 0.01 pH resolution and an accuracy of ±0.05 pH. The LCD screen also has indicators for calibration status and stability, as well as on-screen tutorial messages. The HI991003 has many advanced features that are found in more expensive portable instrumentation including Sensor Check, automatic calibration, buffer recognition,and temperature compensation. The battery percent level is displayed at start up alerting the user to the remaining battery power that is available. 





HI1297 pH electrode

HI1297D pH Electrode

The HI991003 is supplied with the pre-amplified titanium body pH/ORP/temperature electrode. The titanium body is resistant to many aggressive chemicals including those used in plating and chemical manufacturing. The titanium body acts as a matching pin that, together with the built-in amplifier, will help reduce the effects of electrical noise on the high impedance pH measurement. Examples of sources of electrical noise include rectifiers, motors and ballasts.

The HI12973 pH electrode also features an extractable cloth junction. The extractable cloth junction of the HI12973 allows for the renewing of the junction. Simply extract ⅛” of the junction by pulling on the junction will expose a new portion. Any clogging that was present will be cleared and the response time will be back to normal extending the life of the pH electrode.

  • Titanium body that is resistant to harsh chemicals
  • Pre-amplified and matching pin for resistance to electrical noise
  • Extractable cloth junction to clear any clogging
  • Built-in temperature sensor for automatic temperature compensated readings


Features at-a-glance

  • Designed to float if accidentally dropped in a tank
Sensor CheckTM
  • Allows users to check the electrode status at any time
Expanded pH and ORP Range
  • pH range is from -2.00 to 16.00 pH
  • ORP range is ±1999 mV
Automatic Two-Point Calibration
  • One or two-point calibration is automatic to two selectable buffer sets (4.01, 7.01 and 10.01 or NIST 4.01, 6.86, and 9.18).
Automatic Temperature Compensation
  • All readings are compensated for variations in temperature
  • Temperature displayed in °C or °F along with pH reading
Stability Indicator
  • Meter displays a clock tag that will disappear when the reading has achieved stability
HOLD button
  • Freezes reading on the display to allow recording of measurement
BEPS (Battery Error Prevention System)
  • Meter will automatically shut off if there is not enough power to get an accurate measurement
Battery % level at startup 

Low Battery Indicator
  • When the level is below 5%, the  battery symbol on the LCD blinks to indicate a low battery condition.
  • Meter automatically shuts off after 8 minutes of non-use to maximize battery life


More Information
SKU HI991003
Product Name Waterproof Portable pH/pH-mV/ORP/Temperature Meter with Sensor Check™ - HI991003
Quote Required No
pH Range -2.00 to 16.00 pH; -2.0 to 16.0 pH
pH Resolution 0.01 pH; 0.1 pH
pH Accuracy ±0.02 pH; ±0.1 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)
pH Temperature Compensation automatic ‐5.0 to 105.0 °C/23.0 to 221.0 °F
pH CAL Check (electrode diagnostics) probe condition indicator
pH Sensor Check yes
ORP Range ±1999 mV (ORP)
ORP Resolution 1 mV (ORP)
ORP Accuracy ±2 mV (ORP) ±0.5 °C up to 60 °C
±1.0 °C outside ±1.0 °F up to 140 °F
±2.0 °F outside
mV Range ±825 mV (pH‐mV)
mV Resolution 1 mV (pH‐mV)
mV Accuracy ±1 mV (pH‐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 ±0.5°C (up to 60°C); ±1.0°C (outside) / ±1°F (up to 140°F); ±2.0°F (outside)
pH/ORP Electrode HI12973 pre-amplified pH/ORP probe with internal temperature sensor, quick connect DIN connector and 1 m (3.3’) cable (included)
Automatic Shut-Off user selectable
Battery Type/Life 1.5V (3) AAA / approximately 1400 hours of continuous use
IP Protection IP67
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 154 x 63 x 30 mm (6.1 x 2.5 x 1.2”)
Weight 196
Ordering Information HI991003 is supplied with HI1297D pH/ORP probe with internal temperature sensor, HI70004 pH 4.01 buffer sachet (20 mL x 1), HI70007 pH 7.01 buffer sachet (20 mLx 1), HI700601 electrode cleaning solution sachet (2 x 20 mL), 100 mL beaker, batteries, calibration certificates for both meter and probe, instructions, and rugged thermoformed carrying case.
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