Testboy TV 323 Manuel D'utilisation page 27

Operation
During this time, "HOLD" is displayed. After the 10 seconds, the instrument
automatically switches off in order to save the batteries.
Select the required unit (°C/°F) for indication. With the laser switch on, the
laser point marks the approximate centre of the measurement area.
Thereby, it is easier to make accurate measurements.
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Testboy TV 323 27