Voltage Regulator for 5v Step-Up/Step-Down - Pololu

Voltage Sensor Module.

This is an Arduino-Compatible B25 Voltage Sensor Module.

A Water Flow Meter Sensor 6mm Hose designed for your Drinking Water Machine!

A Water Level Sensor 1/2Npt with 0-12VDC, from ProK.

A Whadda Universal Temperature Sensor Mounting Kit, used for measuring indoor and outdoor temperatures, controlling the rise/fall of temperature in homes, equipment, control of temperatures in some processes, visualization of the temperature on your website, control of the temperature of your pool, etc.

The SparkFun ESP8266 WiFi Shield is an Arduino compatible shield for the ESP8266 WiFi SoC – a leading platform for Internet of Things (IoT) or WiFi-related projects. There are a variety of designs based around the ESP8266, including tiny, modular boards and more accessible development boards like our very own SparkFun ESP8266 

DS18B20 is a single-bus digital temperature sensor with features of ultra-small size, wide range of applicable voltage and measurable temperature and high resolution.

A Module with GPRS Antenna, operation Wireless and SIM Card.

XBee 6.3mW Wire Antenna - Series 2C ZigBee Mesh