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HI98129 (pH/Conductivity/TDS Tester; 2000 mg/L)

pH/Conductivity/TDS Tester; 2000 mg/L


  • Waterproof and rugged

  • Widescreen 2 levels

  • Integrated temperature sensor for measuring the temperature and the temperature correction or compensation

  • Electrode / replaceable probe: easy and fast exchange

  • Automatic calibration keyboard

  • Compensation / correction automatic temperature

  • Stability indicator for safe play

  • HOLD function to maintain a value on the screen

  • TDS and temperature coefficient (EC) adjustable factor

  • Battery charge indicator ignition (self-extinguishing in case of insufficient supply)

  • Auto-off after 8 minutes of non-use


Product Description



pH Range 0.00 to 14.00 pH
Conductivity Range 0 to 3999 µS/cm
TDS Range 0 to 2000 mg/L (ppm)
Temperature Range 0.0 to 60.0°C 
pH Resolution 0.01 pH
Conductivity Resolution 1 µS/cm
TDS Resolution 1 mg/L 
Temperature Resolution 0.1°C
pH Accuracy ±0.05 pH
Conductivity Accuracy/TDS Accuracy ±2% F.S.
Temperature Accuracy ±0.5°C 
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)
EC/TDS Calibration automatic, one-point at: 1413 µS/cm, 1382 mg/L (ppm)
Temperature Compensation pH: automatic; EC/TDS: automatic with β adjustable from 0.0 to 2.4% / °C
TDS Conversion Factor 0.45 to 1.00
Battery Type/Life 1.5V (4) / approx. 100 hours of continuous use, auto-off after 8 minutes of non-use
Dimensions 163 x 40 x 26 mm
Weight 100 g 


The HI98129 is a highly accurate, waterproof pH tester that can also measure EC/TDS and temperature. This floating, waterproof combination tester has an easy to read, LCD and an automatic shut-off. In addition, pH and EC/TDS readings are automatically temperature-compensated to prevent temperature related variations in your measurements.

The EC/TDS conversion factor is user selectable as well as the temperature compensation coefficient.

Replaceable pH Electrode Cartridge

The HI98129 tester features an easy to replace pH electrode cartridge with an extendable cloth junction. The extendable cloth junction helps increase electrode life and the replaceable pH cartridge means that this tester does not need to be thrown away when the pH sensor is exhausted. Also, the sturdy, snap-in connector means there are no pins to bend or break!

High Accuracy EC/TDS graphite probe

The graphite conductivity probe provides greater accuracy because it cannot be contaminated by salt deposits in the solution. The exposed temperature sensor provides fast response times and guarantees highly accurate temperature compensated readings.

Fast, efficient accurate and portable, the Combo pH, EC/TDS and temperature tester combines all the features users have requested and more!

Order Information

HI 98121 (ORP/pH) is supplied with HI 73127 pH electrode, HI 73128 electrode remoHI98129 (Combo) and HI98130 (Combo) are supplied with HI73127 pH electrode and HI73128 electrode removal tool, batteries and instructions.val tool, batteries and instructions.

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