Measurement And Display Considerations; Replacing The Electrode; Powering The Exstik™; Accuracy Check Of The Re300 Electrode - Extech Instruments ExStik RE300 User Manual

Measurement and Display Considerations


If the unit appears to be locked (display frozen). It is possible that the Data Hold mode has
been inadvertently accessed by pressing the MODE button. Simply press the MODE button
again or turn the meter off and restart if the display appears frozen.

If the meter does latch up and no button presses revive it, remove the batteries and restart.

Note that if the batteries are removed, any stored readings will be discarded. Factory
calibration data for all models will be retained, however.

Replacing the Electrode

To preserve Electrode life, keep the sponge in the protective cap soaked with
distilled or tap water when not in use (store vertically).
1. To remove an electrode, unscrew and completely remove the electrode collar (turn the collar
counter-clockwise to remove).
2. Gently rock the electrode from side to side, pulling it downwards, until it disconnects from the
meter.
3. To attach an electrode, carefully plug the electrode into the meter socket (note that the
electrode connector is keyed, ensuring proper connection).
4. Tighten the electrode collar firmly enough to make a good seal (a rubber gasket seals the
electrode with the meter).
Powering the ExStik™
The ExStikTM uses four (4) CR2032 batteries (included). If the batteries are weak, the 'BAT'
indicator appears on the LCD. Press the ON/OFF key to turn the ExStikTM on or off. The auto
power off feature shuts the ExStikTM off automatically after 10 minutes of inactivity to preserve
battery life.

Accuracy check of the RE300 electrode

1. Remove cap from the electrode and press the ON/OFF button to switch the RE300 on.
2. Dip the electrode1/2" to 1" into the ORP Standard test solution. Stir once and let the reading
stabilize for 1 to 3 minutes.
3. The measurement should be within +/- 4mV of the ORP Standard.
DO NOT USE DE-IONIZED WATER.
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