220v Stc-3028 Temperature Humidity Control Thermometer Laser meter 3V output from the voltage

3V output from the voltage regulator

this module must be installed on the battery can work normally

Diode Type Single Phase

but the final voltage is slightly lower

220v Stc-3028 Temperature Humidity Control Thermometer Laser meter 3V output from the voltageSTC 3028 Temperature And Humidity Ccontroller AC 220V Feature: This digital temperature and humidity controller with a wide range of humidity measuring and monitoring range, comes with a humidity controller sensor probe and a temperature sensor probe. This temperature and humidity controller is an excellent and convenient multifunctional device for controlling temperature and humidity. Specification: Model: STC 3028 Input Voltage: AC110 ~ 220V