Tested DC Standard Voltage Sensor Module 0-25V Arduino DIY Kit
This module is designed based on the resistor divider principle, which reduces the input voltage by 5 times, the Arduino analog input voltage up to 5V, then the input voltage of the detection module cannot be greater than 5V × 5 = 25V (if using a 3.3V system, the input voltage cannot exceed 3.3Vx5 = 16.5V). Since Arduino's AVR chip is used in 10 AD, the analog module's resolution is 0.00361V (5V / 1023), so the module detects the minimum input voltage is 0.00361V × 5 = 0.02445V.
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