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

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

Pololu Carrier with Sharp GP2Y0A60SZLF Analog Distance Sensor 10-150cm, 3V

Crash sensor(Left)

The Atlas Scientific pH circuit designs currently available on the Internet are outdated and use a significant number of overly complex analog components. Atlas Scientific has reinvented and refined the pH circuit of the past to a more modern and simple to use model.

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

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!