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Equipment for Quality Control and R&D+i

HI9811-5 Portable pH/EC/TDS/Temperature Meter

The HI9811-5 is an economical, wateproof, portable meter that measures pH, conductivity (EC), total dissolved solids (TDS) and temperature (°C) with a single probe. The meter operation is simplified with dedicated buttons for measurement modes to be be displayed on the LCD and knobs for single point calibration of pH and EC/TDS. The HI9811-5 is most suitable for agricultural, greenhouse and hydroponic applications.

The HI9811-5 portable meter features a large LCD which displays either pH, EC, TDS or temperature readings along with tutorial instructions. The HI9811-5 is a simplistic pH/EC/TDS meter that is 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.

The supplied HI1285-5 probe is 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. The HI9811-5 is a versatile meter best suited for agricultural, greenhouse and hydroponic applications.

Features at-a-glance 

  • Water Resistant
  • Automatic Temperature Compensation
  • All readings are compensated for variations in temperature
  • Variable EC to TDS conversion factor
  • Factor automatically adjusts from 0.56 to 0.78 based on actual EC readings
  • Factor based on 442 curve for natural water
  • Low Battery Indicator
pH Range 0 to 14 pH
pH Resolution 0.1 pH
pH Accuracy ±0.1 pH
pH Calibration manual, one-point
EC Range 0.00 to 6000 µS/cm
EC Resolution 10 µS/cm
TDS Range 0 to 3000 ppm (mg/L)
TDS Resolution 10 ppm (mg/L)
EC/TDS Accuracy ±2% F.S.
TDS Conversion Factor 0.5 ppm (mg/L) = 1 µS/cm
Temperature Range 0.0 to 70.0°C
Temperature Resolution 0.1°C
Temperature Accuracy (@ 25°C/77°F) ±0.5°C
Temperature Compensation automatic, 0 to 50°C
Temperature Coefficient β = 2% /°C
Probe HI1285-5 polypropylene body, pre-amplified multiparameter probe with internal temperature sensor, 8-pin DIN connector and 1m cable
Calibration manual, one-point
Battery Type / Life 9V / approximately 150 hours of continuous use
Environment 0 to 50°C (32 to 122°F); RH max 100%
Dimensions 145 x 80 x 36 mm (5.7 x 3.1 x 1.4”)
Weight 230 g (8.1 oz.)



Name Description Quotation Request
HI-1285-5 Quotation Request

Maintenance service and calibration

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