USB Ammeter USB Mini Charger Doctor, Amp Volt Digital Reader, Current Voltage Detection Tool, Mobile Power Charging Monitor Blue(3.5V-7V)（0A-3A）

Product description Xcessor USB Tester – Charger Doctor is a portable charging tester can detect any USB charger such as PC USB, mobile USB, home charger, car charger. High quality testing and troubleshooting tool to check the performance of USB power sources. Suitable for testing and monitoring USB ports on your computer, cellphone, or mobile power supply. Compact and convenient size, no need for extra power supply. Provide accurate measurements and stable performance. Displays the USB port output voltage or amperage. Made of high grade material, resist interference and heat, reliable and durable. Can immediately test current and voltage. Shows one value at the time, switches automatically after few seconds. Work mode: current / voltage automatically switch and show in LED display. Working Voltage: 3.5V – 7.0V, Working Current: 0A – 3A, Voltage Resolution: 1mA, Current 10mV; Display 1.2" LED, Red/Red. Error range: voltage <±1%, current <±2%.