Warning: Damage caused by freezing isn't covered by warranty; we recommend 2-day shipping to reduce risk.
  • PH300
  • Usually ships in 3-5 business days



  • -2.00 to 19.99 pH
  • -1999 to 1999mV
  • 32 to 212°F ( 0 to 100°C)
  • 0.01pH, 1mV, 0.1° resolution
  • ±0.02pH; ±0.15mV; ±°F/±0.5°C accuracy
  • (2) AA batteries, ph buffer solutions and carrying case included
  • 200 point memory

What's in the Box

  • pH / mV / temperature electrode
  • Protective rubber holster
  • pH calibration solutions (4, 7, and 10pH)
  • 2 AA batteries
  • Hard carrying case


The Extech PH300 waterproof pH / mV / Temperature Kit has a waterproof housing which meets an IP57 rating and automatic calibration at four, 7, and 10pH. A choice of 3 point calibration is available for better accuracy.

The Extech PH300 pH / mV / temperature meter has automatic temperature compensation and a memory which stores up to 200 readings with series number measured value and temperature. Featuring a large, blue, backlit dual LCD display, the Extech PH300 pH / mV / temperature meter has an auto power off function that saves battery life and also has a disable function.