Hi,
I bought a Hantek HT890B/HT890C Coating thickness gauge from Amazon UK, but unfortunately it does came without a manual and I can't figure out how to calibrate it, and it needs calibration becaue of 50μm it shows as 78μm, 100μm - as 130μm, 250μm - as 253μm, 500μm - as 430μm and 1000μm - as 760μm.
I searched the internet and Hantek website, but couldn't find it.