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The HI98129 and HI98130 are waterproof testers that offer high accuracy pH, EC/TDS and temperature measurements in a single tester; no more switching between meters for your routine measurements. These floating, waterproof combination testers have an easy-to-read LCD and an automatic shut-off. pH and EC/TDS readings are automatically temperature-compensated.
These testers feature a replaceable pH electrode cartridge with an extendable cloth junction,as well as an EC/TDS graphite electrode. The renewable cloth junction provides an extended electrode life and the replaceable pH cartridge means that this tester does not need to be thrown away when the pH sensor is exhausted.
The EC/TDS conversion factor is user selectable, as well as the temperature compensation coefficient (β). Fast, efficient, accurate and portable, the Combo pH, EC/TDS and temperature testers combine all the features users have requested and more!
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.
The Combo features an easy-to-replace pH electrode. The sturdy, snap-in connector means there are no pins to bend or break.
Simply pull out 3 mm (1/8”) and cut when the cloth junction becomes dirty to improve response time and stability.
0.00 to 14.00 pH
0 to 3999 µS/cm
0 to 2000 mg/L (ppm)
1 ppm (mg/L)
0.0 to 60.0°C / 32.0 to 140.0°F
0.1°C / 0.1°F
automatic, one point at 1413 µS/cm or 1382 ppm (mg/L)
automatic, one or two-point with two sets of standard buffers (pH 4.01 / 7.01 / 10.01 or 4.01 / 6.86 / 9.18)
pH: automatic; EC/TDS: automatic with β adjustable from 0.0 to 2.4% / °C
TDS Conversion Factor
0.45 to 1.00
HI73127 (replaceable; included)
0 to 50°C (32 to 122°F); RH max 100%
Battery Type / Life
1.5V (4) / approx. 100 hours of continuous use; auto-off after 8 minutes of non-use
Dimensions / Weight
163 x 40 x 26 mm (6.4 x 1.6 x 1.0’’) / 100 g (3.5 oz.)
HI98129 (Combo) and HI98130 (Combo) are supplied with HI73127 pH electrode and HI73128 electrode removal tool, batteries and instructions.