• PH90
  • 8 in stock
  • Manufacturer has 50 in stock
    This stock is typically available to ship in 3 - 5 working days.



  • Range from 0 to 14.00 pH
  • Accurate to ±(0.01pH + 1d) or ±0.2pH
  • Maximum resolution 0f 0.01 pH
  • Rugged replaceable flat surface pH electrode for quick on-the-spot pH measurements
  • Simultaneous display of pH and Temperature
  • 2 or 3 point calibration automatically recognizes buffer solutions (order pH buffers separately)
  • PTS (percent of slope) tells you when it's time to replace your electrode (below 70% or above 130%)
  • Automatic Temperature Compensation
  • Data Hold, Min/Max, Auto Power Off, and low battery indication
  • Waterproof design (IP57) floats in water and protects the meter in wet environment
  • Complete with flat surface pH electrode, protective sensor cap, and two 3V CR-2032 button batteries


The Extech PH90 pH Meter is a waterproof water quality meter with rugged IP57 housing and a flat surface electrode for measuring pH in liquids, semi-solids, and solids. The electrode does not break or get junctions clogged like the traditional glass bulb electrodes. The easy to replace sensor is perfect for field or lab use.