... at any time in any place Instructions1,Moving the sliding cap upward to connect the power, long press open key for 3 seconds,full ... to finish a complete test, start from moving the sliding cap upward to connect power , waiting test, then showing test results ,till ... no perspiration ,dust and so on, the test result will be more trueSpecification:power source:dc 3vspraying time:30sworking current:about ...