The Mat stat is a simple, economic thermostat, designed to be used with heat mats to a maximum of 100 watts.
Although heat mats can be used without thermostats, the vivarium temperature can fluctuate with the ambient temperature. Too hot outside and there is the likelihood of the vivarium overheating. With minimal additional cost it can be assured that overheating will not occur in hot weather.
One of the best selling thermostats, alongside the Temperature thermostat.