The USB tester can not only test the current， voltage， capacity， power， function， but also with high-pressure， low-voltage， over-current alarm functions; for your USB devices and power supply equipment escort!The USB tester built-in intelligent charging control IC， can automatically for your phone， tablet PC to match the most appropriate and secure high-current charge， greatly improving the charging efficiency; but also on quality parameters of USB related products provide true and false identification， is a digital player and electronic products lovers Holiday make， but also the safety of mobile phone charging partner! Description:Input voltage:3.20--9.99V Resolution: 0.01V Measuring current: 0.00--3.00A(10A Max， but cannot work in 10A for long time) Resolution: 0.01A Capacitance measurement: 0-99999mA/H Capacitance: YES Capacitance accumulation: YES Power testing: 0.00-9.99-99.9W Over-voltage alarm: when voltage >/=5.6V， voltage digital point will flash quickly Lacking-voltage alarm: when voltage /=3A， current digital point will flash quickly Short-circuit alarm: current digital point will flash quickly Extreme working conditions: Low supply voltage: +3.2 V Maximum supply voltage: +10 V Working temperature: -10 °c~ +65 °c Operating Humidity: 10 ~ 80% (non-condensing) Working pressure: 80 ~ 106kPa Sun exposure: no direct exposure OUTPUT 1 (two functions) : Data communication function : mobile phones or other mobile device and a computer for data transferCharging voltage output function: suitable for most of mobile phones ， mobile power ， tablet PCs and other USB devices， if with Original Charger or other with high-current Identify resistance charger， can also supports IPad， IPhone and Samsung S4 " High Current " charge. OUTPUT 2 (one function): Charging voltage output function: universal-version， suitable for most of mobile phones ， mobile power ， tablet PCs and other USB devices， do not support IPad， IPhone and Samsung S4 " High Current " charge， NO data communication function. Other parameters:Supply voltage， test voltage: 3.2 ~ 15V Overvoltage value:> / = 5.6V， undervoltage value: / = 3A Operating Current: <20mA Display: 0.28 "LED， color (all red)， two-color (red and blue) colors Product Dimensions: 69 × 26 × 19mm USB extension cable: ≥120mm Measurement rate: ≥500mS / times Accuracy: 1% (± 2 words)Extreme working conditions:Low supply voltage: + 3.2VMaximum supply voltage: + 15VWorking temperature: -10 ~ + 65Humidity: 10 to 80% (non-condensing)Working pressure: 80 ~ 106kPaSunlight: no direct exposure