In Radiation Protection Instrumentation practice, an instrument which reads a rate of detected events is normally known as a ratemeter, whereas an instrument which totalises the events detected over a time period is known as a scaler.
In Radiation Protection, an instrument which reads a rate of detected events is normally known as a ratemeter, which was first developed by R D Robley Evans in 1939. An instrument which totalises the events detected over a time period is known as a scaler.