407907-EN v1.5 10/13
Data Hold
To freeze a reading on the LCD, press the HOLD button. Temperature readings require several
seconds to stabilize, therefore use Data Hold only after a reading has fully stabilized. Press the
HOLD button again to return the meter to normal operation.
RS-232 PC Interface
The meter includes a built-in RS232 serial data port. This interface was designed for use with the
Extech Data Acquisition Software (Extech Part Number 407001) and enables the user to store
readings on a PC. For more information, contact Extech or refer to the manual accompanying the
software for details.
Battery Replacement
The low battery indicator (battery symbol) appears on the LCD when the 9V battery needs
replacing. Reliable readings can be obtained for several hours after the first appearance of the low
battery indicator. To replace the battery:
1. Remove the meter’s rubber protective holster.
2. Remove the battery compartment cover (back of meter) using a small coin or screwdriver.
3. Replace the 9V battery (heavy duty, alkaline type) and reinstall the cover.
4. Replace the rubber holster.
4-wire RTD input pin-out
