
To alternate between optical and contact probe modes on the Sauermann CT 110 tachometer, adhere to the following steps: First, press the "Select" button. The display will show "PROBE" flashing. Confirm by pressing "OK". The screen will then display the currently active probe type blinking. Use the "Select" button to toggle between "OPTIC" for the optical probe and "CONT" for the contact probe. Validate your selection by pressing "OK". "PROBE" will flash again. Finally, press "On/Off/Esc" to return to the measurement screen. This process allows you to easily switch between the two measurement methods offered by your Sauermann CT 110 tachometer.


