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AP-2: AquaPro Water Quality Tester (EC)

AP-2: AquaPro Water Quality Tester (EC)
AP-1 Fridge Keep the AquaPro on your fridge. It's magnetic!
Where to buy: Find a distributor in your region.

HM Digital introduces its new AquaPro series, a line of handheld TDS/EC meters with a sleek design that's perfect for today's modern kitchen. The AquaPro digital water testers are the next generation for today's tech-savvy and health-conscience consumer.

Instruction Manual


  • Measures electrical conductivity (EC) and temperature.
  • Automatic Temperature Compensation (ATC)
  • Water-resistant housing
  • Measurement Range: 0-9999 µS
  • Digital Calibration (push button)
  • Auto-off function, data-hold function and low-battery indicator.
  • Display: large and easy-to-read LCD screen includes simultaneous temperature reading.
  • Factory Calibrated: The AquaPro is calibrated with a 700 µS solution. The meter can be recalibrated with digital calibration using the push buttons, rather than a screwdriver.
  • Includes a cap and batteries.
  • Includes a storage case.
  • Magnetic body (patent pending)
  • Need help deciding which meter is right for you?  View our TDS/EC Meter Selection Guide.



EC Range: 0-9999 µS (µS/cm)  
Temperature Range: 0-80 °C; 32-176 °F 
Resolution: 1 µS; Temp. resolution is 0.1 °C/F 
Accuracy: +/- 2% 
Calibration: Digital calibration by push button. 
Housing: Water-resistant
Power source: 1 x 3V button cell (included) (model CR2032)
Dimensions: 15 x 2.8 x 1.3 cm (5.9 x 1.1 x .5 inches) 
Weight: 42.5 g (1.5 oz)

UPC: 891144000137

U.S. PATENT D602,384S


To convert µS (micro-Siemens) to mS (milli-Siemens): divide by 1000.

1000 µS = 1 mS 

EC = Electrical Conductivity



>> Looking for a TDS meter?  If you are looking to measure TDS (in PPM), we recommend not purchasing an EC meter.  Instead, we suggest one of these TDS meters: