Measurement and Control Products for WEATHER Measurement and Control Products for WATER Measurement and Control Products for ENERGY Measurement and Control Products for MACHINES Measurement and Control Products for STRUCTURES Measurement and Control Products for EARTH

The 18166 is a factory-installed version of the 18165 enclosure door-open indicator. When you purchase an enclosure and the 18166, Campbell Scientific will install the 18165 in the enclosure before the enclosure leaves the factory. The price includes the 18165 door-open indicator