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The ETF 012 senses the ambient temperature and relative air humidity. Depending on which contact combination is chosen, it then turns on or off a connected device if either the temperature is below or the humidity is above the set point. The integrated LED in each adjustment knob is lit when indicating the active function.
| Instrument Type | Controller |
| User Interface | |
| Display Style | Analog |
| Front Panel | Analog Front Panel |
| Electrical Output | "Output" is a switch or alarm signal |