Welch Allyn 9600 Plus, Manual

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Directions for Use Chapter 4 Maintenance 29
9600 Plus Calibration Tester Checks
If several thermometers do not pass the calibration verification
tests, check the 9600 Plus Calibration Tester to determine if it is
out of calibration. Before sending the unit to an authorized Welch
Allyn service center, complete the checks listed below.
1. Check the calibration date on the side of the 9600 Plus
Calibration Tester. If the 9600 Plus Calibration Tester was
calibrated over 12 months ago, do not use it. Send it to an
authorized Welch Allyn Service center immediately for
calibration.
2. Ensure no one has tampered with the 9600 Plus Calibration
Tester. If someone has tampered with the unit or the
calibration label(s), the calibration settings and warranty are
void. Send it to an authorized Welch Allyn Service center
immediately for calibration.
3. Ensure the 9600 Plus Calibration Tester is not exposed to
extreme temperatures that can damage the precision
thermistor. Exposure to high heat can cause the resistance
versus temperature characteristic of the unit to shift, causing
the 9600 Plus Calibration Tester to become inaccurate. Send
it to an authorized Welch Allyn Service center immediately for
calibration.