Hanna Instruments HI 3220 - Manual (Page 7)

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10) ON/OFF switch.
11) Power adaptor socket.
12) USB connector.
13) BNC electrode connector for channel two (HI 3222 only).
14) Temperature socket for channel two (HI 3222 only).
15) Reference electrode connector for channel two (HI 3222 only).
16) BNC electrode connector for channel one.
17) Temperature socket for channel one.
18) Reference electrode connector for channel one.