Probe guide for a precise coating thickness measurement on small parts such as screw heads, nuts, washers etc. The press-down lever for letting down the probe can be set in an appropriate ergonomic angle position by easy pulling-turning-locking. For secure measurement the guide can be fixed to a table board with a clamp. For easy reading of the display the gauge Surfix® can be fixed to the steel cylinder of the probe guide using an appropriate holder.