The ZMPT101B Single Phase AC Voltage Transformer Module can measure AC voltages up to ±250V (50Hz/60Hz) and outputs a scaled down AC voltage between 0V and VCC (5V - 30V) with a DC offset of VCC/2.
The ZMPT101B module comes with a multi turn trim potentiometer for adjusting the amplitude of the output waveform around the DC offset to make the output range suitable for an external ADC.