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HIOKI 3129 Phase DetectorNon-Metallic Contact for Optimal SafetyMagnetic adapter, Fixable to distribution boards. Top “primary supply level” safety class rating for phase detectors. CAT III 600V design meets CE Mark qualifications. Provides both visual and audible phase detection. Detects phase on insulated conductors. Auto power-off function prevents inadvertent battery dischargeVoltage Detection Method : Electrostatic induction methodVoltage Range : 70 to 600V AC (50/60Hz)(sine wave,continuous input)Clamp Diameter : 2.4mm(0.09in) to 17mm(0.67in) of insulated wiringDisplay : Phase Detection : Positive ; 4 LEDs lit in clockwise order and 3 short beeps Negative ; 4 LEDs lit in counterclockwise order and one continuous beep Live Wire Check : R-S and S-T lamps will light if voltage between wires are within voltage rangeBattery Check Function : ON lamp blinks to indicate battery low status when instrument is turned onAuto Power Off : Auto shut off if no activity is detected after power is turned ON for 15 minutesPower supply : Two AA size batteries × 2 (rated voltage:DC3.0V; maximum rated ower:300mVA)Continuous Use : approx.70 hours (standby)Dimensions, mass : 70 mm (2.76 in)W × 75 mm (2.95 in)H × 30 mm (1.18 in)D, 200 g (7.1 oz),Cord length : 0.7m(27.56 in)Accessories : Carrying case(1), strap(1), R6P manganese batteries(2), spiral tube(1)