... , Network cable tester ,PTZ tester, CCTV Camera tester Product Characteristic1. 3.5-inch high definition digital TFT-LCD screen 2. Brightness, contrast and color saturation ... Voltage0-660V automatic/manual measure, the mini resolution reaches to 0.1mVAC/DC Current660uA , 6.6mA, 66mA , 660mA, 10AResistance660, 6.6k ...