It measures (RPM) the engine revolutions of RC helicopters, airplanes and multirotors. - Sensor points for the blades within a measuring distance of 10 centimeters - Backlit LCD can be activated / deactivated by pressing the "set" button for 3 seconds. - To measure the RPM of a rotating propeller from 2 to 9 blades, storing the peak RPM data REPLACEMENT FOR MODELS RC: HIMOTO - SEBEN-AMAX -HSP-RADIOKONTROL-HISPEED - KYOSHO - ETC. THIS PRODUCT IS COVERED BY AN ITALIAN CERTIFICATE THERE IS AND IT IS COMPLIANT WITH THE EUROPEAN COMMUNITY DIRECTIVE. Pursuant to the DL January 15, 1992 n. 50, the buyer can exercise the right by giving notice by registered letter with return receipt to be sent to: In case of applicability of the right of withdrawal, the buyer is required to return at his own.