This module is based on a resilient divider principle design, 

interface terminal input voltage is reduced by a factor of 5. It has a maximum input value of 25v. 

So the maximum output value you can get by giving 25v is 5v.

 

Input voltage: DC0 ~ 25V

Test range: DC0.02445V ~ 25V

Analog resolution: 0.00489V 

 

GND - Minus lead 

VCC : Positive lead

Q: Connects to your Arduino analog input.