The replacement rubber concave and convex tips are part of the Remote Contact Assembly used with the PLT200 Tachometer. (Remote Contact Assembly and replacement 10 cm Linear Wheel sold separately.)

Measurement of units in addition to revs requires the attachment of the assembly and tips/wheels. With this attachment, the unit can measure RATE inputs-revs, inches, feet, yards, centimeters, and meters either per second, per minute, or per hour, as well as miles per hour.