pH/EC/TDS/Temperature meter with HI1285-51 electrode; EC range: 0 to 1990 µS/cm, TDS range: 0 to 1990 ppm (mg/L)

SKU : d9d0cc1a3e24

The HI9812-51 is a portable, water resistant meter designed to be paired with HI1285-51 pH /EC/TDS/Temperature multiparameter probe. The meter is easy to use, with dedicated keys for measurement modes that are clearly displayed on the LCD, and knobs for 1-point calibration of pH and EC. On-screen tutorial messages guide the user through calibration and measurement.

  • 3 in 1 probe with pH, EC/TDS and temperature sensors
  • Best for hydroponics, greenhouses, farming, and ground water applications
  • Large LCD with instructions
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The HI9812-51 is a pH/EC/TDS meter for agriculture, greenhouse and hydroponics applications.

These meters feature a large LCD which displays either pH, EC, TDS or temperature readings along with tutorial instructions. The pH readings are displayed with a 0.1 resolution and an accuracy of +/-0.1 pH while the EC and TDS readings are displayed with a 10 mS/cm and 10 ppm (mg/L) resolution and 2% full scale accuracy. The temperature correction coeffcient (?) is fixed at 2 %/°C and allows for automatic temperature compensated measurements of EC and TDS. These meters are calibrated manually to a single point with the use of two trimmers. pH is calibrated to pH 7.01 while EC/TDS is calibrated to either 1.41 mS/cm (1413 µS/cm) or 1500 ppm. The LCD screen has battery life indicator as well as on-screen tutorial messages.

No probe changes are required when switching your measured parameter between pH, conductivity and TDS. These multiparameter meters reduce the number of instruments required for daily water quality analysis.

The supplied probe on all models feature a polypropylene body, amplified pH electrode with a built-in EC/TDS and temperature sensors. The amplifier for the pH electrode prevents interference from humidity and electrical noise from common sources including from motors, ballasts or pumps.



Specification NameDetail
pH Range0.0 to 14.0 pH
pH Resolution0.1 pH
pH Accuracy (@25°C/77°F)±0.1 pH
pH Calibrationmanual, 1-point through offset trimmer
Temperature Range0.0 to 70.0 °C
Temperature Resolution10°C
Temperature Accuracy (@25°C/77°F)±1°C
Temperature Calibration Automatic, from 0 to 70°C with ß=2% / °C
EC Range0 to 1990 µS/cm
EC Resolution10 µS/cm
EC Accuracy (@25°C/77°F)±2% F.S.
EC Calibrationmanual, 1-point through slope trimmer
TDS Range0 to 1990 ppm (mg/L)
TDS Resolution10 ppm (mg/L)
TDS Accuracy (@25°C/77°F)±2% F.S.
TDS Conversion Factor0.5 ppm (mg/L) = 1 µS/cm
TDS Calibrationmanual, 1-point through slope trimmer
Power Supply9V / approximately 450 hours of continuous use
Environment0 to 50°C (32 to 122°F); RH max 100%
Dimensions145 x 80 x 36 mm (5.7 x 3.1 x 1.4”)
Weight230 g (8.1 oz.)
Ordering InformationHI9812-51 is supplied with HI1285-51 multiparameter probe, HI70007 pH 7.01 calibration solution sachet, HI70032 1382 ppm (mg/L) calibration solution sachet, HI70031 1413 µS/cm calibration solution sachet, HI700661 electrode cleaning solution sachets (2), 9v battery (1), instructions and rugged carrying case.
Warranty2 years
Recommended ProbeHI1285-51 polypropylene body, pre-amplified multiparameter probe with internal temperature sensor, 8-pin DIN connector and 1 m (3.3’) cable