Turn it Off: Press and Hold the <GO> button until the display reads “Shutting Off – Good Bye.”
Display Serial Number: Turn on the refractometer and press and hold the <MENU> button until the serial number is displayed. On newer instruments, the firmware version number and serial number are displayed.
Display Temperature: To display the temperature of the last reading, simultaneously press and hold the <GO> and <MENU> buttons for a few seconds and then simultaneously release them. The temperature of the last reading will be displayed in the form “t=+20.0° C.” Temperature is only displayed in degrees Celsius. To convert from Celsius to Fahrenheit, multiply Celsius by 9, then divide by 5, then add 32.
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