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HI991300 (Portable pH/EC/TDS/Temperature Meter)

Portable pH/EC/TDS/Temperature Meter


  • Easy-to-clean and maintain

  • Multi-level LCD display

  • On-screen tutorial messages for calibration and setup

  • Automatic Temperature Compensation

  • Automatic one or two-point pH calibration

  • BEPS: Alerts the user in the even that low battery power could adversley affect the readings

  • Battery % displayed on startup

  • Compact, heavy duty, and waterproof


Product Description



pH Range 0.00 to 14.00 pH
pH Resolution 0.01 pH
pH Accuracy ±0.01 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)
Conductivity Range 0 to 3999 µS/cm
Conductivity Resolution 1 µS/cm
Conductivity Accuracy ±2% F.S.
TDS Range 0 to 2000 ppm (mg/L)
TDS Resolution 1 ppm (mg/L)
TDS Accuracy ±2% F.S.
Temperature Range 0.0 to 60.0°C / 32.0 to 140.0°F
Temperature Resolution 0.1°C / 0.1°F
Temperature Accuracy ±0.5°C /±1°F
Temperature Compensation                              pH: automatic; EC/TDS: automatic with β adjustable from 0.0 to 2.4% / °C
EC/TDS Calibration automatic, one-point at: 1382 ppm (CONV=0.5), 1500 ppm(CONV=0.7), 1413 µS/cm
TDS Conversion Factor 0.45 to 1.00
Electrode/Probe HI1288 PVC body, pre-amplified multiparameter probe with internal temperature sensor, DIN connector and 1m cable
Battery Type/Life 1.5V (3) AAA / approximately 500 hours of continuous use; auto-off after 8 minutes of non-use
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 152 x 58 x 30 mm (6.0 x 2.3 x 1.2”)
Weight 205 g (7.2 oz.)


The HI991300 and HI991301 have been designed to offer pH, conductivity (EC), total dissolved solids (TDS) and temperature measurements in a slim, lightweight, and portable unit. From purified to brine water measurement, users can select the meter which will work best with the expected range of conductivity for greater precision. With just two buttons, users can select from a range of calibration buffers and even the temperature scale (°C or °F) that is most familiar. The housing is waterproof and rated for IP 67 conditions.

The HI1288 pre-amplified multiparameter probe features an easy-to-clean sensor and a cloth junction that can be renewed to increase the life of the probe. To ensure against interference from transient electrical noise, a solid-state amplifier is integrated into the HI1288.

User selectable features include different TDS factors from 0.45 to 1.00 and a range of temperature coefficients (β) from 0.0 to 2.4% for greater consistency and reproducibility. Standardized buffer recognition values are also selectable.

These instruments easily fit in the palm of your hand and the bottom probe connection ensures the electrode cable doesn’t get in your way. The large, multi-level LCD displays the primary reading, temperature, and calibration guides simultaneously.

Order Information

HI991300 is supplied with HI1288 multiparameter probe, HI70004 pH 4.01 buffer solution sachet, HI70007 pH 7.01 buffer solution sachet, HI70031 1413 µS/cm calibration solution sachet, HI70032 1382 mg/L (ppm) calibration solution sachet, HI700661 electrode cleaning solution sachet, batteries, instructions and rugged carrying case.