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How many times we seen posts asking "my phone is not charging fast enough" or "I have a bunch of usb cables and old chargers, which one to use"? So how do you find this perfect combo of charger and cables to give you the fastest charging speed? Use our Charger Doctor!!! The USB Charger Doctor is a small device that goes in series with your usb cable to measure the devices voltage and current consumption. Within a few minutes you are able to get rid of all faulty phone chargers and cables. What a time saver and problem solver easily one of best diagnostic tools available. This is a great USB Charger Doctor. Plug it in to any USB port or charger and it automatically tells you what the voltage and charging Amperage is. Great for finding out if your wall charger is any good, needs replaced or how much power a device is drawing. Large LED numbers, without external power supplies Feature: The display cycles every 5 seconds between amps and volts in a red LED display Great tool for verifying USB voltage and device charging rate Detect any USB charger such as PC USB, home charger, car charger Widely 3V-8V Voltage and 0A-3A Current Test Range Support with Accurate Readings Extremely Portable, Light Weight, Small Size and Durable, No Extra Cable or Power Supply Needed Specifications Scope of work: Current (0-3A) can detect mobile phone charger voltage compliance DC5V Working Range: U = 3~7.5V; I = 0~3A Resolution:10mV / 10mA Error Range: voltage