7REL Relative mode
Pressing REL key to enter the Relative mode, zero the display, and store the displayed Reading as a reference value and annunciator REL is displayed. Present temperature reading displayed on second display. Press REL key again to exit the relative mode.
The relative value can also be entered by the user. (See "SET mode" later in this manual.)
When the desired Relative value has been entered, press REL key to enter the Relative mode, press SET key use set Relative value as a reference value. Press REL key again to exit the relative mode.
In the Relative mode, the value (can not >±3000.0 counts) shown on the LCD is always the difference between the stored reference and the present reading.
8°C/°F Selecting the Temperature Scale (Second display) Readings the second displayed in either degrees Celsius(°C) or degrees Fahrenheit(°F). When the thermometer is turned on, it is set to the temperature scale that was in use when the thermometer was last turned off. To change the temperature scale, press the °C/°F key.
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