The Noyafa NF-488 PoE Checker is a versatile inline tester designed for network professionals to quickly and accurately check the voltage and current of PoE switches. With an LCD display and back light, this tester is easy to read and use in various settings. It is compatible with switches ranging from 10M to 1000M and can test RJ45 cables with a max testing range of 600m. The NF-488 also features wire mapping function for network cables, making it a valuable tool for troubleshooting and maintenance tasks. Powered by 3 AAA batteries, this PoE checker is a reliable and efficient tool for any network testing needs.