VOLTCRAFT DO-101 Operating Instructions Manual page 31

1 Probe connection socket
2 Display
3 "HOLD/ESC" button
4 "POWER" on/off and backlight button
5 Up and temperature unit switching button
6 "SET" button
7 "ENTER" button
8 Down and measurement function switching button (pH/mV)
9 "REC" button
10 Tripod thread (1/4" UNC 20)
11 Fold-out stand clamp
12 RS232 interface (3.5 mm jack socket, mono)
13 Reset button
14 Power supply socket 9 V/DC (5.5 mm x 2.5 mm)
15 Opening recess for socket cover
16 Battery compartment
17 Probe connection plug
18 Probe handle
19 Integrated temperature sensor
20 Replaceable membrane head
21 Probe protective cap
22 Replacement membrane head
23 Electrolyte
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