Stemedu DC 0-25V Voltage Detection Sensor Voltage Terminal Measurement Module up to 25V, Test Electronic Bricks for Robot for Arduino for Raspberry Pi (Pack of 5pcs): Amazon.com: Industrial & Scientific
Digital Multimeter with Arduino (Measure Voltage, Resistance and Diode)
Building An Arduino Smart IC Tester For $25 | Hackaday
Amazon.com: Geekstory Voltage Tester Sensor Measurement Detection Module DC 0-25V Terminal Sensor Module for Arduino UNO Mega Robot Smart Car Geekstory (Pack of 10) : Electronics
Arduino Multimeter V1.0 | DIY Arduino Project | Voltage, Resistance, Continuity tester and more - YouTube