Omega OMEGAETTE HHT=1501 - Manual (Page 11)

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3.2. Using the Mechanical Adaptor (Option RM1502)
a. Select proper rubber head.
b. Attach the mechanical adaptor to the unit.and fasten the screw.
c. Press the unit button (left button) to select RPM / ( instead of RPM
only). The auxiliary LED will be turned on while the main LED will be
turned off.
d. Press against the shaft of the object to be measured.
e. Do not press against the shaft too hard to avoid hazard.
WARNING: Do not exceed the speed limit of 29999 rpm when using
mechanical adaptor.