POWER SOURCE The unit operates on 1 x DC1.5V G10 button cell battery. CHANGING BATTERY The battery has to be replaced when the unit’s display gets dim. 1. Unscrew and remove the Battery Door from the back of the unit. 2. Replace the exhausted battery with a new one with positive (+) terminal facing upwards. Important i. Be sure that the battery is installed correctly according to the polarity diagram on the rating label. Wrong polarity may damage the unit. ii. For better performance and longer o