Lutron Electronics CO2-9904SD Operation Manual page 11

3-1 Display
3-2 Power Button ( Backlight Button )
3-3 Hold Button ( ESC Button )
3-4 REC Button ( Enter Button )
3-5 Alarm Button ( Button )
▲
3-6 Function Button ( Button )
▼
3-7 Time Button
3-8 Logger Button ( SET Button, Sampling check )
3-9 Stand
3-10 Battery Compartment/Cover
3-11 Battery Cover Screw
3-12 Tripod Fix Nut
3-13 Humidity Probe Input Socket
3-14 CO2 Probe Input Socket
3-15 O2/CO Probe Input Socket
3-16 DC 9V Power Adapter Input Socket
3-17 Reset Button
3-18 RS-232 Output Terminal
3-19 SD Card Socket
3-20 Humidity Sensing Head
3-21 Humidity Probe Plug
3-22 CO2 Sensing Head
3-23 CO2 Probe Plug
3-24 O2 Sensing Head
3-25 O2 Probe Plug
3-26 CO Sensing Head
3-27 CO Probe Plug
9