W3230 high precision temperature controller digital display temperature controller module temperature control switch US $0.05-$1.00
STC-3028 temperature and humidity controller temperature and humidity control dual-purpose greenhouse incubation humidifier US $3.00-$5.00
ESP-32 ESP32 esp-wroom-32 Development Board WiFi Ultra-Low Power Consumption ESP32 Board US $0.25-$0.34