7
RPM: Non-Contact revolutions per minute measurements (rotation rate test, only select it).
rPm: Contact revolutions per minute measurements.
I/M: Contact Inch per minute measurements.
M/M: Contact Meter per minute measurements.
Y/M: Contact Yard per minute measurements.
F/M: Contact Feet per minute measurements.
REV: Revolution measurements.
M: Length (Using the master 10cm circumference wheel.) measurements in the unit of metre.
Y D: Length measurements in the unit of feet.
Remark
Non-contact measurement should avoid the blinking light source in the front or around the target,
such as a fluorescent lamp which will cause the wrong reading.