The CG204 is a portable meter designed for non‐invasive coating thickness measurements. The CG204 has automatic recognition for ferrous and non-ferrous substrates. Two measurement methods are used by this meter: magnetic induction (for ferrous metal substrates) and eddy current (for non‐ferrous metal substrates). Software and a USB cable are included for further data analysis on a PC. The Extech CG204 Conforms to to the following industrial standards: GB/T 4956-1985, GB/T 4957-1985, JB/T 8393-1996, JJG-889-95, and JJG 818-93