Figure 1. HMT370EX transmitter external parts. The external parts of the transmitter are shown in Figure 1, and the internal parts of the transmitter are shown in Figure 2. 1 Detachable probe body 2 Transmitter body (for internal parts, see Figure 2) 3 Graphical LCD display (see Display options) 4 Display interface buttons (see Local display overview) 5 Wall pads (4 pcs) 6 Retrofit mounting plate for replacing HMT360 installations (optional) 7 Probe body locking wheel 8 Probe head (for information on different probe options, see HMT370EX probe options overview) 9 Grounding terminal 10 Lead-throughs for wiring (for lead-through accessory options, see Cable gland and conduit options) Figure 2. HMT370EX transmitter internal parts 1 Holes for mounting screws 2 Screw terminals and output test points: see 2a and 2b 2a Analog output channel 1 and 2 multimeter test points for current and voltage 2b Screw terminals for wiring analog output channels 1 and 2 3 Cable fastening clamps 4 Transmitter grounding terminal 5 Transmitter service port covered with a plug to protect the port (M8, requires Vaisala USB cable accessory) 6 Plug to protect the probe connector when a probe is not connected