ID: 
1066
Maker's Name: 
Max Kohl, AG
Where made: 
Germany
Dimensions: 
15.2 × 9.2 × 5.8 cm

A mechanical revolution counter that with a stopwatch serves as a tachometer.

Two scales are marked 10 to 40 and 3 to 12.

Covers the range 100 RPM (revolutions per minute) to 4000 RPM.

Several adaptors allow connection to different shafts.