Amprobe TACH-10 [3730008] Contact and Non-Contact Tachometer. The Amprobe TACH-10 Contact / Non-Contact Tachometer is a universal, economical tachometer measuring rotational or surface speed either in contact or non-contact way. The Amprobe TACH10 is widely used to measure rotational speed of motors, conveyer belts and other moving or rotating systems.