The CAL6B is typically a 6-digit LED display unit used to measure rotational speed (RPM), linear speed, or count events. It is designed to be mounted in a control panel (DIN standard).
The Calculagraph is a mechanical calculator that was popular in the early 20th century. The Cal6b model was likely a specific variant of the Calculagraph, but I couldn't find much information about it. cal6b calculagraph manual
Before plugging in your Cal6B, perform a visual inspection of the housing and power cord. The CAL6B is typically a 6-digit LED display
While in standby mode, long-press the button until the display shows "NS" (millisecond mode) or "HM" (hour-minute mode). cal6b calculagraph manual
: Features a loud, adjustable-volume buzzer designed to be heard in noisy commercial environments. Flexible Placement