3. FRONT PANEL DESCRIPTION
3-1.Display
3-2.Power/Backlight button
3-3.HOLD key button
3-4.REC key button
3-5.TIME/SET key button
3-6.ENTER/LOG key button
3-7.▲/FUNCTION key button
3-8.▼/ALARM key button
Fig. 1
3-9.SD card socket
3-10.RESET button
3-11.ALARM socket
3-12.RS232 socket
3-13.DC 9V power adapter socket
3-14.PM2.5 Air sampling inlet(Air filter net)
3-15.PM2.5 Air sampling outlet
3-16.Battery Cover/Battery compartment
5