ฺBattery power switch
Using the screwdriver provided, turn on the battery power switch at the bottom of the display unit ( see Fig 1.2 (C)) This switch is preventing deterioration, though over discharge, of Ni- Cd storage batteries, when the surftest 211 is not use for a long period. Because the surftest 211 has a built-in "Auto-Sleep" function which automatically cuts power when the instrument is ledt idle, the battery power switch should be ON at all times, expect when the surftest is not used for a long period.