pH/Conductivity/TDS/°C Meter 0.0 -14.0pH/4.00 mS/cm/1999 ppm (mg/L) CAL CHECK™



Item no. HI-9813-61

More details

321 €

HI 9813-61 is a versatile, water resistant multiparameter portable meter specifically designed for agriculture, hydroponics, greenhouses, and nurseries. It features an extra large LCD that clearly displays the parameter being measured as well as calibration instructions. With CAL Check feature.

Portable pH/EC/TDS/Temperature meter

This meter features 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 0.01 mS/cm and 1ppm (mg/L) resolution and 2% full scale accuracy. The EC range of both meters is from 0.00 to 4.00 mS/cm and TDS is from 0 to 1999ppm. The temperature correction coefficient (β) is fixed at 2%/°C and allows for automatic temperature compensated measurements of E and TDS.

This meter 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 1.41mS/cm or 1500ppm. The LCD screen has batter life indicator as well as on-screen tutorial messages

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

The supplied probe 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.

HI-9813-61 CAL CheckTM Feature

The HI-9813-61’s CAL Check feature alerts users if there is a problem with the pH electrode. This feature is important for customers that calibrate only to pH 7.0; if there is a fracture on the pH glass of the electrode, the pH meter will always display pH 7.0 regardless of the solution being measured. This can be disastrous for the person that calibrates at pH 7.0 and takes readings of samples with an expected pH of 7.0. The user will never be aware that there is a problem. Placing the HI-1285-61 pH/EC electrode in HI-50021 CAL Check solution and pressing the “Check” button helps users determine if the probe needs to be calibrated, cleaned or replaced. The meter runs CAL Check diagnostics and will display either “probe is OK” or “clean probe and calibrate”. If the reading is around pH 4.0 when the probe is placed in the solution then the probe is broken and needs to be replaced.

About the HI-1285 series probes

The HI-9813-51 and HI-9813-61 are supplied with a polypropylene body pH/EC/TDS/temperature probe. The pH, EC, TDS and temperature sensor are housed in a single body that connects to the meter with a DIN connector.


3 sensors in a single probe

Amplified pH electrode – The pH electrode has a built-in amplifier that will reduce the effects of electrical noise on the high impedance pH measurement. Examples of sources of electrical noise include motors, ballasts, and pumps which are common in greenhouses.

Amperometric EC/TDS sensor – The EC/TDS readings are performed by an amperometric sensor. An alternating voltage is applied to the sensor and the amount of current that passes between the two stainless steel pins is dependent upon the amount of salts (fertiliser) present. A greater amount of salt present results in an increase in conductance.

Specification Detail
pH Range 0.0 to 14.0 pH
pH Resolution 0.1 pH
pH Accuracy (@25°C) ±0.1 pH
pH Calibration manual, one point
Temperature Range 0.0 to 60.0°C 
Temperature Resolution 0.1°C
Temperature Accuracy (@25°C) ±0.5°C
EC Range 0.00 to 4.00 mS/cm
EC Resolution 0.01 mS/cm
EC Accuracy (@25°C) ±2% F.S.
EC Calibration manual, 1-point through trimmer
TDS Range 0 to 1999 ppm (mg/L)
TDS Resolution 1 ppm (mg/L)
TDS Accuracy (@25°C) ±2% F.S.
TDS Conversion Factor Variable based on reading from 0.56 to 0.72 according to the TDS 442 curve for natural water
Temperature Compensation automatic from 0 to 50°C with β=2%/°C typical
Power Supply 1 x 9V alkaline battery
Power Consumption approximately 150 hours of continuous use
Environment 0 to 50°C ; RH max 100%
Dimensions 145 x 80 x 36 mm
Weight 230 g
Ordering Information

Supplied with HI1285-6 pH/EC/TDS/°C probe with Cal-CheckTM, HI70007 pH 7.01 buffer solution sachet (1),

HI70442 1500 ppm calibration solution sachet (1), HI70031 1413 µS/cm calibration solution sachet (1),

HI700661 electrode cleaning solution sachets (2), HI50021 calibration check solution sachets (2), 9V battery, instructions and rugged carrying case.

Related Products