Resonance Rev Counter Treysit / Sirometer (0929)
Index: 0929
Year: ?
Maker: Treysit-Presserei, Schwalmstadt, Germany
Dimensions: Diam 9 x 2 cm
Info
Rev counter that works based on the resonance of the wire that can be extended from the spool. As soon as there is resonance, one can read the revs or the frequency from the scale.
This tools seems to be in production since 75 years and is made in the owners home. See the link below.
Inscriptions:
RPM-U/MIN IN 1000
TREYSIT
DREHZAHLMESSER
CYCLES PER SECOND-HERTZ
DGM
MADE IN GERMANY
