REED R3500 pH Meter


High accuracy pH meter with replaceable electrode.

REED R3500 Offers

This digital pH pen displays both temperature and pH simultaneously on a dual LCD display. The R3500 features automatic temperature compensation for accurate readings and includes a built-in calibration procedure.


  • Dual LCD displays temperature and pH measurements
  • User selectable °F or °C
  • Automatic temperature compensation
  • Replaceable pH electrode module
  • Data hold function
  • Waterproof housing
  • Protective cap keeps sensor moistened
  • Low battery indicator and auto shut off

REED R3500 Specifications


Measuring Range 32 to 140°F (0 to 60°C)

Accuracy ±1.8°F (1°C)

Resolution 0.1°F (0.1°C)


Measuring Range 0.00 to 14.00 pH

Accuracy ±0.02 pH

Resolution 0.01 pH

General Specifications

Display Dual Display, LCD

Data Hold Yes

Auto Shut-Off Yes (after approximately 10 minutes)

Waterproof Yes

Low Battery Indicator Yes

Power Supply 4 x LR44 Cell Batteries

Operating Temperature 32 to 122°F (0 to 50°C)

Storage Temperature 14 to 122°F (-10 to 50°C)

Operating Humidity 10 to 80%

Dimensions 7.3 x 1.6 x 1.6" (185 x 40 x 40mm)

Weight 3.1oz (88g)

What's included with the REED R3500

  • pH Meter
  • Protective Cap
  • Hard Carrying Case
  • Batteries

Ideal Applications for the REED R3500

  • Water conditioning
  • General purpose pH measurement
  • Aquariums
  • Wastewater monitoring
  • Beverage production