On/Off thermostats should be used for controlling the temperature of non-light emitting heat sources only. Maximum load of 300w.
Thermostats are well known to be some of the most important pieces of equipment for the vivarium. They are used purely as a prevention device to stop accidental overheating and to have a greater control of the enclosure temperature.
These particular stats are an on/off device, which simply means they switch off when they reach the desired temperature, and switch themselves back on again when the temperature starts to drop.
You can select the temperature by adjusting the centre dial with a small flat headed screwdriver and setting it at your desired temperature.
Probe position is important and varies depending on the type of equipment you are using with the thermostat. The product manufacturer encloses additional instructions advising on the best position in each situation.
We would advise not to rely 100% on the calibration setting of any thermostat, this can vary depending on the probe position and it's good husbandry practice to manually check the temperature with a digital thermometer.