#2	Testing is as easy as connecting the included well insulated clips of the unit to the three phase circuit under test and the unit will indicate the of open phase phase sequence thru the LEDs and buzzer
#3	Continuous Use Time 60 minutes at 200V AC 4 minutes at 600V AC Maximum Withstand Voltage 2000Vmin impulse voltage 4000V
#4	It is not allowed to be used in outdoor and humid environment when it is raining to avoid unsafe accidents
#5	Do not expose the instrument to water or other corrosive liquids and do not place it in an environment with direct sunlight or high temperature and relative humidity so as not to affect its test performance