Omega OMEGAETTE HHT=1501 - Manual (Page 12)

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3.3. Measurement of Surface Speed(m/min, ft/min, or yd/min)
a. Attach the mechanical adaptor (option RM-1502) to the unit.
b. Press the unit button to select desired unit. The auxiliary LED will
be turned on while the main LED will be turned off.
c. Slightly touch against the surface to be measured.