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


The HI991003 is a compact, waterproof, portable pH/temperature meter that is supplied complete including a rugged carrying case and a unique titanium body pH electrode that has a built-in temperature sensor. The meter features a large, dual level LCD display for easy viewing of the pH, 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
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Πληροφορίες προϊόντος



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



Product NameWaterproof Portable pH/pH-mV/ORP/Temperature Meter with Sensor Check™
Stock Status MessageCall if accurate shipping time is required
Quote RequiredNo
pH Range-2.00 to 16.00 pH; -2.0 to 16.0 pH
pH Resolution0.01 pH; 0.1 pH
pH Accuracy±0.02 pH; ±0.1 pH
pH Calibrationautomatic, 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 Compensationautomatic ‐5.0 to 105.0 °C/23.0 to 221.0 °F
pH CAL Check (electrode diagnostics)probe condition indicator
pH Sensor Checkyes
ORP Range±1999 mV (ORP)
ORP Resolution1 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 Resolution1 mV (pH‐mV)
mV Accuracy±1 mV (pH‐mV)
Temperature Range-5.0 to 105.0°C / 23.0 to 221.0°F
Temperature Resolution0.1°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 ElectrodeHI12973 pre-amplified pH/ORP probe with internal temperature sensor, quick connect DIN connector and 1 m (3.3’) cable (included)
Automatic Shut-Offuser selectable
Battery Type/Life1.5V (3) AAA / approximately 1400 hours of continuous use
IP ProtectionIP67
Environment0 to 50°C (32 to 122°F); RH max 100%
Dimensions154 x 63 x 30 mm (6.1 x 2.5 x 1.2”)
Ordering InformationHI991003 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.