Surface contact thermostat Honeywell 10/40 °C | Bola Systems
Amazon.com : iPower 2-Pack Digital Heat Mat Thermostat 40-108 Degrees Fahrenheit Warming Pad Temperature Controller for Germination, Seedlings Rooting, Brewing, 1000W-Green, White : Patio, Lawn & Garden
Ac220v 0-40c Temperature Switch Thermostat Temperature Controlled Switch Temperature Controller Control Waterproof Junction Box - Thermometer Hygrometer - AliExpress