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

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.

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

Waterproof

Designed to float if accidentally dropped in a tank

Sensor Check™

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 ℃ or ℉ 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.

Auto-Off

Meter automatically shuts off after 8 minutes of non-use to maximize battery life

SKU	HI991003
Name	Waterproof Portable pH/pH-mV/ORP/Temperature Meter with Sensor Check™ – HI991003
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: after 8 min, 60 min or disabled
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

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.

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

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