This is a temperature sensor switch module with stable performance and easy installation. The product's working principle is that the relay works when the temperature is equal or higher than working temperature; when the temperature is equal or higher than stopping temperature， the relay off.  

Features:
Stable and precise performance and simple operation， meeting the users' needs.
Increase the power supply anti-reverse function.
Adopts optically-coupled isolation of the input and output.
The setting parameters can be memorized after power off.
Critical value stabilizing circuit， the output will not change in 0.2°C difference.
Power saving function: long press the K1 can turn on/off the nixie tube.

How to operate the buttons:
After connected with the power supply， short-press K1 to set the working temperature T1， K2 and K3 can adjust the temperature value; 
Then short-press K1 to enter stopping temperature T2 setting， K2 and K3 can adjust the temperature value; 
At last， short-press K1 to display the real-time temperature， 

Specifications:
Temperature Range: -40-125°C
Relay: AC 220V 10A， DC 30V 10A
Static Current: 20mA
Working Current: 50mA
Working Voltage: 12V
Probe Length: 100cm / 39.4in
PCB Board Size: 64 * 38 * 18mm / 2.52 * 1.5 * 0.7in
Item Weight: 51g / 1.81oz
Package Size: 11.5 * 7.5 * 2cm / 4.53 * 2.95 * 0.8in

Package List:
1 * Temperature Sensor Module