Hasselblad Exposure Light Meter Knob or Crank (54011). Condition - 4E [6328].

This replaces the standard knob on the 500C, 500C/M and 503CX. It contains a selenium cell exposure meter. This is a very useful and durable accessory. The meter does not take any batteries - so nothing to go flat, leak or corrode. When mounted to the camera it will operate in a 'reflective mode'. It can also be used as an 'incident' meter by engaging the translucent cover.