The Voltage Sensor Module 25V is a simple device that can be used to monitor voltages much higher than the analogue input of a microcontroller is capable of sensing. The module works by using a potential divider to reduce the input voltage by a factor of 5.

Features:

Resistant voltage divider design
Screw terminals for easy and secure connection
Analog input voltage up to 5V
Input voltage limit of 25V (for 3.3V systems, input voltage limit of 16.5V)
Dimensions: 28 x 14 x 13 mm (LxWxH)
Weight: 4 gm

Specifications:

Input Voltage Range: DC 0 to 25V
Voltage Detection Range: DC 0.02445V to 25V
Analog Voltage Resolution: 0.00489V
Note: The voltage limit of your Arduino input is restricted to voltages less than 25 volts. Any voltage greater than that will exceed the voltage limit.