REED 8689 Digital pH Meter/Pen, 0.00 to 14.00 pH, Waterproof


This Digital pH pen displays both temperature and pH simultaneously on a dual LCD display. The 8689 features automatic temperature compensation for accurate readings and includes easy one touch calibration.


  • Dual LCD displays temperature and pH measurements
  • User selectable °F or °C
  • Automatic temperature compensation
  • One touch calibration with adjustable points
  • Easily replaceable pH electrode module
  • Data hold function
  • Waterproof housing (IP65)
  • Protective cap keeps sensor moistened
  • Low battery indicator and auto shut off


Measuring Range32 to 140°F (0 to 60°C)
Accuracy±1.8°F (1°C)
Measuring Range0.00 to 14.00
Accuracy±0.05 pH
Resolution0.01 pH
General Specifications
DisplayDual Display, LCD
Data HoldYes
Auto Shut-offYes (after 20 mins)
WaterproofYes (IP65)
Low Battery IndicatorYes
Power Supply4 x LR44 Cell Batteries
Product CertificationsCE
Operating Temperature32 to 140°F (0 to 60°C)
Storage Temperature14 to 140°F (-10 to 60°C)
Operating Humidity Range10-80%
Dimensions6.9 x 1.5 x 1.5" (176 x 39 x 39mm)
Weight3.9 oz (110 g)