XBee 6.3mW Wire Antenna - Series 2C ZigBee Mesh

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

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.

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 

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.

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

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

This is an Arduino-Compatible B25 Voltage Sensor Module.

Voltage Sensor Module.

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

The Vma449 integrates the Voice Recorder ISD1820 and Playback CI to record a single message up to 20 seconds long. The recorded message is stored in the analog flash memory that keeps the message stored even in the event of a power failure. The module has an integrated microphone to record your message and buttons for recording, partial playback or full reproduction of the message functions.

This Voice Recognition Module with Microphone for Arduino can recognize up to 15 voice instructions and be suitable for most cases involving voice control. With this module, we can control cars or other electrical devices by voice.

VL6180X Time-of-Flight Distance Sensor Carrier with Voltage Regulator

The Pololu USB to serial adapter is great for connecting microcontroller designs to a personal computer. The adapter uses 3.3 V signal levels so you can connect it directly to any microcontroller running at up to 5 V without the hassle of an RS-232 to TTL level converter.

This UV Sensor is capable of detecting UV solar radiation using a simple UVM-30A chip. It can be easily configured for projects with Arduino to monitor UV Index, analyze UV-A lamps or DIY projects as plant growth analysis.

TOSR02-T - USB / Wireless 5V 2-channel Relay Module Support for temperature sensor

Kit Thermostat with LED Indicator - Velleman.

Detecting temperature changes has never been easier. The MCP9700 is a small thermistor type temperature sensor. 

Temperature Sensor - Grove

SW-420 Motion and Vibration Sensor Module.