Extech ExStik II Dissolved Oxygen Meter

The Extech ExStik II Dissolved Oxygen Meter measures oxygen levels and simultaneously displays dissolved oxygen and temperature.


  • Adjustable salinity compensation from 0 to 50ppt
  • Memory stores up to 25 data sets with DO and temperature reading
  • Self calibration on power up
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The Extech ExStick II Dissolved Oxygen Meter displays oxygen levels as % saturation from 0 to 200.0% or concentration from 0 to 20.00ppm (mg/L). The memory stores up to 25 data sets with dissolved oxygen and temperature readings. The altitude compensation is adjustable from 0 to 20,000 feet in 1,000 feet increments, and the salinity compensation is adjustable from 0 to 50 ppt. The analog bargraph displayed on the LCD indicates sample trends. Other meter functions included data hold, automatic power off, and low battery indicator.

  • Dissolved oxygen (saturation mode) range: 0 to 200.0%
  • Dissolved oxygen (saturation mode) resolution: 0.1%
  • Dissolved oxygen (saturation mode) accuracy: ±2% FS
  • Dissolved oxygen (concentration mode) range: 0 to 20.00ppm (mg/L)
  • Dissolved oxygen (concentration mode) resolution: 0.01ppm (mg/L)
  • Dissolved oxygen (concentration mode) basic accuracy: 0.4ppm (mg/L)
  • Temperature range: 32 to 122°F (0 to 50°C)
  • Temperature resolution: 0.1°F/°C 
  • Temperature basic accuracy: ±1.8°F (1°C)
  • Dimensions: 1.4x6.9x1.6" (36x176x41mm)
  • Weight: 3.8oz (110g)
  • (1) ExStik meter
  • (1) Dissolved oxygen electrode
  • (1) Protective sensor cap
  • (1) Spare membrane cap with electrolyte
  • (4) 3V CR-2023 batteries
  • (1) 48" neckstrap
Questions & Answers
How is oxygen level displayed?
Oxygen Level can be displayed as % Saturation from 0 to 200% or Concentration from 0 to 20ppm (mg/L)
Do I need to calibrate my meter?
No, the meter self calibrates on power up.
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