Hanna Instruments Australia
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Sales: (03) 9769 0666   |    Mon to Fri: 8:30am – 5:00pm
Hanna Instruments Australia
Sales: (03) 9769 0666   |    Mon to Fri: 8:30am – 5:00pm

pH/EC/TDS/Temperature meter with electrode - HI9811-51


Prices include GST. Not all items are in stock. Call 03 9769 0666 to confirm.

pH/EC/TDS/Temperature meter with HI1285-51 electrode; EC range: 0 to 6000 µS/cm, TDS range: 0 to 3000 ppm (mg/L).

The HI9811-51 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 combination probe with pH, EC /TDS, and temperature sensors
  • Best for agriculture, greenhouse, and hydroponics applications


The HI9811-51 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 coefficient (β) 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 1382 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 features a polypropylene body, an 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 Name Detail
sku HI9811-51
pH Range 0.0 to 14.0 pH
pH Resolution 0.1 pH
pH Accuracy @ 25°C / 77°F ±0.1 pH
pH Calibration manual, 1-point through offset trimmer
Temperature Range 0.0 to 70.0 °C
Temperature Resolution 0.1°C
Temperature Accuracy @ 25°C / 77°F ±0.5°C
Temperature Calibration Automatic, from 0 to 70°C with ß=2% / °C
EC Range 0 to 6000 µS/cm
EC Resolution 10 µS/cm
EC Accuracy @25°C/77°F ±2% F.S.
EC Calibration manual, 1-point through slope trimmer
TDS Range 0 to 3000 ppm (mg/L)
TDS Resolution 10 ppm (mg/L)
TDS Accuracy @ 25°C / 77°F ±2% F.S.
TDS Conversion Factor 0.5 ppm (mg/L) = 1 µS/cm
TDS Calibration manual, 1-point through slope trimmer
Power Supply 9V / approximately 450 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.)
Ordering Information HI9811-51 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.
Warranty 2 years
Recommended Probe HI1285-51 polypropylene body, pre-amplified multiparameter probe with internal temperature sensor, 8-pin DIN connector and 1 m (3.3’) cable

All prices are inclusive of GST and not all items are stock items, if you require an immediate solution please send an email to sales@hannainst.com.au or call us on (03) 9769 0666.

Free standard delivery: We offer free delivery within Australia on orders over $100, typically arriving within 5 to 7 days. Delivery times may vary depending on the courier service and the recipient's location. Free shipping is not available with other offers or discounts.

Same-day despatch: Place your order before 1 PM Monday to Friday for same-day despatch. Delivery times may vary depending on the courier service and the recipient's location. Subject to stock availability.

Please note that we do not offer shipping to PO Box addresses.

Additional information

Weight 0.230 kg