CEM DT-903 is a Socket Polarity and Earth Leakage Tester and can test 3 wire 220V AC outlets and earth leakage circuit breakers(ELCB).

Specification:
• Socket Polarity and Earth Leakage Tester
• Tests Three Wire 220V AC outlets and Earth Leakage Circuit Breakers
• Power Supply: From Unit Under Test
• Confirms to CAT III 600V
• Electrical Safety: IEC 61010/EN 61010; IEC 61557-7/EN 61557-7
• Indicates the following Status: No Earth, Line Neutral Reversal, No Neutral, Line Earth Reversal, No Line