The RCA includes two contact tips (concave and convex) and a 10 cm linear contact wheel
With the PLT200 Tachometer, measurement of units in addition to Revs requires the attachment of the Remote Contact Assembly (RCA) and tips/wheels. With this attachment, the tachometer 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. The RCA includes two contact tips (concave and convex) and a 10 cm linear contact wheel.
Remote Contact Assembly User Manual
Shipping Codes for the Remote Contact Assembly:
Harmonized Tariff Code: 9029900000
Country of Origin: US
Export Control Classification Number (ECCN): EAR99