13Section 4 System Start Up4.1 Power upTurn on the switch at the back of the MET ONE 237 particle counter (refer to Figure 6 onpage 12). The counter will display the main screen when turned on (Figure 7 on page15). If the LO BATT indicator is lit, plug in the AC adaptor to charge the battery. Thecounter may be operated during the charging of the battery.Note: Use the AC adapter provided by the manufacturer to charge the battery or operate thecounter. Other off-the-shelf power modules may have different power, current or polarity which coulddamage the counter.
