pH Range: 0.00 to 14.00 pH
pH Resolution: 0.01 pH
pH Accuracy (@25ºC/77ºF): ±0.05 pH
Conductivity Range: 0 to 3999 µS/cm
Conductivity Resolution: 1 µS/cm
Conductivity Accuracy (@25ºC/77ºF): ±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 (@25ºC/77ºF): ±0.5°C /±1°F
EC/TDS Calibration: automatic, one-point at: 1413 µS/cm, 1382 ppm (mg/L)
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)
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
pH Electrode: HI73127 (replaceable; included)
Battery Type/Life: 1.5V (4) / approx. 100 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: 163 x 40 x 26 mm (6.4 x 1.6 x 1.0’’)
Weight: 100 g (3.5 oz.)
Ordering Information: HI98129 is supplied with HI73127 pH electrode and HI73128 electrode removal tool, batteries (4 x 1.5V) and instructions.
Warranty: 1 year
The HI98129 is an easy-to-use and accurate waterproof pH, conductivity, TDS (ppm) tester. It measures pH, EC in the low range (0 to 3999 µS/cm), TDS (0 to 2000 ppm), and temperature. This floating, waterproof combination pocket tester has an easy to read, LCD and an automatic shut-off. All pH, EC, and TDS (ppm) readings are automatically temperature compensated (ATC) to prevent temperature-related variations in your measurements. For EC and TDS (ppm) readings, the EC/TDS conversion factor (CONV) is selectable by the user, as well as the temperature compensation coefficient β (BETA).
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!
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.
3 sensors in a single tester
pH electrode with extractable junction
Amperometric EC/TDS sensor
Exposed temperature probe for faster EC and TDS (ppm) readings
Wide pH Range
Selectable EC to TDS (ppm) conversion factor
BEPS (Battery Error Prevention System)