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Features of UT18 Series Voltage and Continuity Testers Certifications: CE, UKCA, cETLus ● RCD test (Operating voltage: 230V/50Hz~400Hz) ● Polarity detection: Positive & Negative ● Self-inspection: All LED or LCD ● Exceed voltage (voltage range: 713V~788V) ● Auto standby (standby current < 10μA) ● Silent mode: All range ● Work light ● Low battery indication: around 2.5V