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KEYPAD
Battery Installation
• Four (4) 'AA' batteries or an AC/DC adaptor powers the meter.
• Install the batteries into the rear battery compartment observing correct polarity.
• When the adaptor is used, the batteries are disconnected from the meter circuitry. The
adaptor cannot be used to charge rechargeable batteries.
• When battery voltage is low, the battery symbol (
promptly.
Never dispose of used batteries or rechargeable batteries in household waste.
As consumers, users are legally required to take used batteries to appropriate collection sites, the
retail store where the batteries were purchased, or wherever batteries are sold.
Disposal: Do not dispose of this instrument in household waste. The user is obligated to take end-
of-life devices to a designated collection point for the disposal of electrical and electronic
equipment.
POWER ON/OFF, SET
Short press to power the Meter ON or OFF
With the meter OFF, long press to enter setup mode
Long press
/SET and H/ to enable or disable APO mode
START/ESCAPE
Short press to exit setup mode
Long press to begin data logging
MODE/RECALL
Short press to change the display modes
Long press to recall manually stored readings
HOLD/UP ARROW
Short press to freeze or unfreeze reading on the display
Short press while in setup mode to select units or increase the
value
Long press
/SET and H/ to enable or disable APO mode
MEMORY/DOWN ARROW
Short press to save readings into memory
Short press in setup mode to select units or decrease the
value
MIN/MAX/AVG/TWA/STEL, SAVE
Short press to select MIN, MAX, TWA, STEL function
Short press in setup mode to save settings
) appears. Replace the batteries
5
CO260-en-GB_v1.0 8/17
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Need help?
Do you have a question about the CO260 and is the answer not in the manual?
Questions and answers
How do I calibrate this meter?
To calibrate the Extech Instruments CO260 meter for relative humidity:
1. Ensure calibration is performed in a controlled temperature environment of 25°C.
2. Plug the sensor probe into a 33% salt solution bottle.
3. Long press the ESC, MEM, and SET buttons simultaneously to enter calibration mode.
4. The LCD will blink "CAL" and display the current value (e.g., 32.8% at 25°C).
5. The meter will calibrate for about 60 minutes until the value stops blinking.
6. The calibration is complete once the value remains steady.
Caution: Do not calibrate without the default calibration salts, as this may cause the meter to lose calibration data and become inoperable. Contact Extech for calibration salts or services if needed.
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