It's an ESP8266 WiFi module with all the extras you need
The kit is programmed using MicroPython
You can solder wires directly to the board or solder in either the 4×1 straight male header strip or the 4×1 right-angle male header strip that is included
which is the ideal solution for indoor air quality monitor
Inputs - 2 Volt Free Contact (VFC)
MB7851 TankSensor PHI_Mechanical It's an ESP8266 WiFi moduleFeatures of the weather resistant MB7851, Tank Sensor, includes millimeter resolution, short to long distance detection, range information from 50 mm to 5000 mm for liquid level detection, a ~2Hz read rate, and three simultaneously available outputs: a real time analog voltage envelope, a scaled analog voltage, and serial communication in either RS232 or TTL format. The MB7851 Tank Sensor is a low cost liquid level monitoring sensor that uses