Technical characteristics Model: SM852B works Operating voltage: 60~600V (three-phase AC current) Maximum withstand voltage: 2000V/min (4000V pulse voltage)Measurable frequency range: 20Hz~400Hz Continuous Use Time: 200V ACV, no more than 60 minutes, 600V ACV, no more than 4 minutes Meter Size: 85 x 64 x 23 mm (excluding test leads) Weight: approx. 200g 1. LED for open phase inspection: three orange LEDs, indicating U-phase, V-phase and W-phase respectively. 2. LEDs for phase sequence control: one red LED and one green LED respectively 3. Strap: place it on the wrist to prevent the instrument from slipping from the hand. 4. Test pen. 5. Test leads: red corresponds to phase U(R) (L1, R), yellow corresponds to phase V(Y) (L2, S) and green corresponds to phase W(B) (L3, T ). Instructions for use Connect the test lead of the instrument to the wire under test (cannot be pinched directly by hand), which can be a wire head, a socket or the middle part of the wire phase (when measuring in the middle part of the phase wire, it is necessary to insulate the wire. The measurement can only be carried out by peeling off the layer and exposing the inner core. At this point, special attention should be paid to safety to avoid electric shock. For the convenience of users, the instrument accessories are equipped with special test clamps. Insert the test clip into the metal probe of the test lead and tighten it. It can be easily clipped anywhere for measurement). At this time, the meter will indicate the status of the open phase and the sequence of the phases according to the light-emitting diode (LED) and the buzzer. Instrument accessories: Test leads and test leads, clamps test bag, straps, instruction manual and carrying case. Appearance Description Shipping Quantity: 1 piece