REES52 Voltage Tester

Plug it into any powered USB port and check that it is supplying the stated output voltage and current to keep all of your devices charging as efficiently as possible and that their batteries are still in good condition to avoid data loss. The power analyser is also great for checking that USB wall chargers are working to their full potential too! Measures volts, Amps, time and capacity Convenient pocket sized unit Suitable for any USB socket Product Features: It adopts the OLED screen, it can clearly display all the data. And it display white color font, It forbid for being used for inductive load, eg: the load with motor and fan. it can be used digital products, eg: mobile phone,power bank,USB flash drive etc..