Hanna Instruments

Scientific Equipment

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HI-98318 GroLine Waterproof EC/TDS (ppm) Tester

HI-98318 GroLine Waterproof EC/TDS (ppm) Tester

Hanna HI-98318 GroLine Waterproof EC/TDS (ppm) Tester

HI-98318 GroLine Waterproof EC/TDS (ppm) Tester

Conductivity range: 0.00 to 6.00 mS/cm
TDS range: 0 to 3000 ppm
In Stock
£62.10 (exc. VAT) £74.52 (inc. VAT)

The Groline waterproof EC/TDS tester is ideal for hydroponics, greenhouses, or anywhere you need quick and accurate conductivity measurements.

Clear, easy-to-read screen

Fast Automatic Temperature Compensation, plus EC/TDS Graphite sensors that reduce polarisation effects

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HI-98318 GroLine Waterproof EC/TDS (ppm) Tester information

Hanna's extended description

The HI-98318 is our latest pocket meter for measuring the EC/TDS of a hydroponic nutrient solution. The ergonomic design allows this tester to fit comfortably in your hand. The large easy to read LCD display shows both EC or TDS and temperature along with calibration, stability and low battery indicators. All operations are simplified to two buttons. One is for turning the meter on/off and the other for automatic one point calibration.

The GroLine Waterproof EC/TDS Tester is made specifically for hydroponics, providing a simple, inexpensive solution to measure fertiliser concentration in a nutrient solution.

The HI-98318 EC/TDS tester has a graphite sensor that reduces the polarisation effect common with amperometric testers that use two stainless steel pins.

Automatic calibration is achieved easily. Simply submerge the sensor in calibration solution and the meter will automatically detect the calibration standard (5.00 mS/cm in Quick Cal mode or 1.41 mS/cm in standard calibration mode). Temperature is automatically compensated for with the integrated temperature sensor.

Key Features

  • Waterproof
  • Fast Automatic Temperature Compensation with exposed temperature probe
  • Graphite sensors that reduce polarisation effects
  • 0.5 (500 ppm) and 0.7 (700 ppm) selectable EC to TDS conversion factors
  • Single point automatic calibration using Quick Cal standard or 1.41 mS/cm in standard calibration mode
  • 250 hour battery life
  • Easy two button operation


Specifications list


Conductivity Range 0.00 to 6.00 mS/cm
Conductivity Resolution 0.01mS/cm
Conductivity Accuracy ±2%F.S.
TDS Range 0 to 3000 ppm (500CF); 0 TO 3999 PPM (700CF)
TDS Resolution 10 ppm (mg/L)
TDS Accuracy ±2%F.S.
Temperature Range 0.0 to 50.0°C
Temperature Resolution 0.1°C
Temperature Accuracy ±0.5°C
Temperature Compensation automatic from 0 to 50°C
TDS Conversion Factor 0.5 (500ppm) or 0.7 (700 ppm)
Environment 0 to 50°C; RH max 100%
Dimensions 160 x 40 x 17mm
Weight 75g
Ordering Information HI-98318 GroLine EC/TDS meter is supplied with protective cap, (4) HI-50036 Quick Cal calibration sachets (20ml), (1) CR2032 battery, instruction manual, and quality certificate

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