Review on 💡 USB Tester Type C Meter - USB Digital Multimeter Amperage Power Capacity Reader & USB C Current Voltmeter & Voltage Monitor Tester & Amp Amperage Charging USB Detector Checker DC 0-30V/0-6.5A: Complete USB Testing Solution by Brady Shayotovich

This is very useful for checking almost all USB chargers/cables and battery capacity. I mainly used it to test USB-C Lightning chargers. It's worth the price as you can weed out bad cables/chargers to ensure you get the fastest possible charge. On the input side it is very accurate. However, when a load is connected, the output voltage is most often (but not always) around 100mV when tested simultaneously with a multimeter. It's not really a big deal as you should be more concerned with the current going into the device and it's very accurate in that regard (also tested with a multimeter). I have two other USB meters and they both show slightly different readings (input and/or output) so it's not unique to this device. However, I will probably use it the most as it has a micro USB input which is great for testing cables. The device is a little wobbly. I wouldn't recommend hanging this thing on the wall with the power supply. Try to put as little strain on the meter as possible by using an extension cord and something to support the meter while reading. There are no instructions. I had to use YouTube to figure out how to fully utilize the device. This includes quickly pressing the button 1 to 5 times for different settings and holding the button on power up to adjust some parameters. Having tested many different devices, my best advice is this: if you need the fastest possible charge, always use the shortest charging cable you have and never use "flat" charging cables (just throw them away. Trust me).