REED 8689 pH Meter

Digital pH Pen, Reed Instruments, REED 8689


REED 8689 Offers

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

REED 8689 Specifications

Measuring Range 32 to 140°F (0 to 60°C)
Accuracy ±1.8°F (1°C)
Resolution 0.1°F/°C
Measuring Range 0.00 to 14.00
Accuracy ±0.05 pH
Resolution 0.01 pH
General Specifications
Display Dual Display, LCD
Data Hold Yes
Auto Shut-off Yes (after 20 mins)
Waterproof Yes (IP65)
Low Battery Indicator Yes
Power Supply 4 x LR44 Cell Batteries
Product Certifications CE
Operating Temperature 32 to 140°F (0 to 60°C)
Storage Temperature 14 to 140°F (-10 to 60°C)
Operating Humidity Range 10-80%
Dimensions 6.9 x 1.5 x 1.5″ (176 x 39 x 39mm)
Weight 3.9 oz (110 g)

What’s included with the REED 8689

  • Digital pH Meter/Pen
  • Protective Cap
  • Wrist Strap
  • Batteries

Ideal Applications for the REED 8689

  • Water Conditioning
  • General purpose pH measurement
  • Aquariums
  • Wastewater monitoring
  • Beverage Production