Hanna GroLine Waterproof pH EC TDS Temperature Combo Tester – HI98131


Please read the entire contents of the booklets and handouts that come with all PH instruments carefully.

SKU: GH_OFGI Category:


Product Code: K1720
The HI98131 is a slim, lightweight, and waterproof pocket sized meter that measures pH, conductivity (EC), total dissolved solids (TDS) and temperature. The meter operation is simplified with two buttons. One is used for on/off and for calibration while the other is used to switch between the measurement modes. The HI98131 has advanced features including a selectable EC to TDS conversion factor (0.5 – 500 ppm and 0.7 – 700 ppm).
The HI98131 GroLine tester features a large multi level LCD which displays both pH, EC or TDS and temperature readings simultaneously. The pH readings are displayed with a 0.01 resolution and with an accuracy of +/-0.05 pH, while the EC and TDS readings are displayed with a 0.01 mS/cm and 10 ppm (mg/L) resolution and 2% full scale accuracy. The EC range of the HI98131 is from 0.01 to 6.00 mS/cm and TDS is from 0 to 3000 ppm using a 0.5 conversion factor. The HI98131 also offers the option to use a 0.7 (700 ppm) EC to TDS conversion factor. An exposed temperature sensor allows for rapid temperature compensated measurements of EC and TDS. The LCD screen has indicators for calibration status and stability. The battery percent level is displayed at start up alerting the user to the remaining battery power that is available. The HI98131 is a versatile pocket meter designed for hydroponics, greenhouse and agriculture applications.
Features at-a-glance
3 sensors in a single meter
pH electrode with extractable junction
Amperometric EC/TDS sensor
Exposed temperature probe for faster EC/TDS readings
Designed to withstand the humidity of a growing environment
Wide pH Range
pH range is from 0.00 to 14.00 pH
Selectable EC to TDS conversion factor
Choice of either a 0.5 or 0.7 conversion factor
0.5 (500 CF) conversion factor is for an EC reading of 1000 μS/cm = 500 ppm
0.7 (700 CF) conversion factor is for an EC reading of 1000 μS/cm = 700 ppm
Automatic Temperature Compensation
All readings are compensated for variations in temperature
Temperature displayed in oC or oF along with pH, EC or TDS 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.
Selectable time before meter will automatically shuts off to conserve battery life. Options are after 8 minutes, 60 minutes , or disabled.
pH Range0.00 to 14.00 pH
pH Resolution0.01 pH
pH Accuracy±0.1 pH
pH Calibrationautomatic, at one or two points using standard buffers (pH 4.01, 7.01,10.01); one point calibration using quick calibration solution
pH Temperature Compensationautomatic
EC Range0.00 to 6.00 mS/cm
EC Resolution0.01 mS/cm
EC Accuracy±2% F.S.
EC Calibrationautomatic, one-point at 1.41 mS/cm or 5.00 mS/cm; one point calibration using quick calibration solution
TDS Range0 to 3000 ppm (500 CF); 0 to 3999 ppm (700 CF)
TDS Resolution10 ppm (mg/L)
TDS Accuracy±2% F.S.
TDS Calibrationdone through conductivity
EC/TDS Temperature CompensationEC/TDS: automatic with β set at 1.9%/°C
EC to TDS Conversion Factor0.5 (500 ppm) or 0.7 (700 ppm)
Cell Typeamperometric two pole
Temperature Range0.0 to 60.0°C / 32.0 to 140.0°F
Temperature Resolution0.1°C / 0.1°F
Temperature Accuracy±0.5°C /±1°F
Automatic Shut-Offauto-off after 8 minutes of non-use
Battery Type/Life1.5V (4) / approx. 100 hours of continuous use
Environment0 to 50°C (32 to 122°F); RH max 100%
Dimensions163 x 40 x 26 mm (6.4 x 1.6 x 1.0”)
Weight100 g (3.5 oz.)
Ordering InformationHI98131 is supplied with HI73127 pH electrode, HI73128 electrode removal tool, batteries (4), instructions and quality certificate.

Additional information

Weight 0.5 kg
Dimensions 3 × 7 × 20 cm