Duct point temperature sensor with a 1K ohm nickel (at 32 degrees Fahrenheit) sensing element. This unit has an 8-inch (20 cm) probe, 2 x 4 electrical box housing and is Siemens compatible.
Duct point temperature sensor with a 1000 ohm platinum (385 alpha) sensing element. This unit has a 4-inch (10.2 cm) probe and 2 x 4 electrical box housing construction.
Duct point temperature sensor with a 10K ohm NTC Type II sensing element. This unit has an 8-foot (2.4 m) probe and 2 x 4 electrical box housing construction.