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

Converter of Level Logic 3.3V and 5V 8 Channels.

This small digital distance sensor detects objects between 2 cm and 10 cm apart. With its fast response time, small size and low current consumption , this sensor is a good choice for detecting non-contact objects in compact PCBs facilitating integration into your project.

This package includes a Sensor of Level of Water and a Sensor of Humidity from Solo. If the plates have water covering the sensor components, an analog value will be available on the "SIG" connection. The Sensor of Level of Water can detect up to 4cm of water. This way, you can check if your aquarium, or your pet's water bowl, still has enough water. You can use the Sensor of Moisture of the Soil to check your plant's soil or growing environment, for example.

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

The CNY70 has a compact construction where the emitter and receiver are arranged in the same direction to detect the presence of an object using the object's reflective IR beam.

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.

The 5-Channel Infrared Detector Sensor Module is designed to optimize robotics and electronics projects.

This is the Infrared Proximity Sensor made by Sharp.