UT18B Voltage Meter can provide AC and DC voltage (including the three-phase alternating current) measurement, phase of three-phase AC power indicator, on-off test, RCD Test, single pen measurement (can determine the zero line or wire), self checking, no battery detection and other functions. Suitable for: smelting, electronics, manufacturing, defense, electric power, petroleum, chemical industry. Feature - With self checking, RCD test and on-off test. - RCD Test: Operating Voltage:230V(50Hz400Hz). - voltage range: 12/24/50/120/230/400/690V. - Single pen measurement (can determine the zero line or wire). - Phase rotation test operating voltage: 100V-690V, frequency: 50Hz- 60Hz. - Single lead (L2) voltage detection operating voltage: 100V-690V, frequency: 50Hz- 400Hz. - Continuity Test Resistance: 0-100K Omega;. Beeper and LED light Indicator. - For smelting, electronics, manufacturing, defense, electric power, petroleum, chemical industry. Specifications: - Color: Red and Grey - Material: Plastic - Size: 272 x 85 x 31mm - voltage range: 12/24/50/120/230/400/690V - Phase rotation test operating voltage: 100V-690V, frequency: 50Hz- 60Hz - Single lead (L2) voltage detection operating voltage: 100V-690V, frequency: 50Hz- 400Hz - Continuity Test: 0-100K Omega; - RCD test operating voltage: 230V(50Hz-400Hz) - Power: 1.5V AAA Batteries x 2 (not included) Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.