Figure 1. Indigo300 transmitter parts 1 Display 2 Push button for transmitter display navigation 3 LED status indicator. Lights up when the display is turned off. 4 Locking wheel with a connector for probe or probe cable. Alternatively, this lead-through can be ordered with a fixed cable and M16×1.5 cable gland pre-installed. 5 Lead-through for cables. Plugged, or equipped with a M16×1.5 cable gland or conduit fitting NPT 1/2". 6 Lead-through for cables. Plugged, or equipped with a M20×1.5 cable gland or conduit fitting NPT 1/2". 7 Grounding terminal 8 Service port for connection to Insight PC software or Indigo80 handheld indicator 9 Rubber lead-through for cables, at the backside 10 Transmitter base: mounting base and screw terminals for cables 11 Top cover: display and circuit board The lead-through options (locking wheel, cable glands, conduit fittings, and plugs) are selected when ordering the transmitter.