Review on 🌡️ DZS Elec Temperature Controller: -50 to 110 Celsius / (-58 to 230 F) Programmable Thermostat Module for Heating/Cooling Control, DC 12V, NTC Waterproof Sensor Probe, LED Display by William Dean

Works as intended. Good compact size. I suspect that some dissatisfied customers have connected it wrong (the output relay is a dry contact only, ie it has no current output, so it has to be connected in series (between) one branch of the power supply and the device being controlled). The screw terminals are a bit unreliable, you have to be careful with a sufficiently long end of the wires and tightening of the screws. With two caveats: - It is not possible to use the high temperature alarm P6 as the parameters only include ON/OFF and there is no temperature setting. - The LED display is really too bright for normal indoor use. If you sleep in the same room you will not sleep at night. I wish it could be dimmed but haven't found a way to contact the manufacturer.