Very small size and low unit cost make it possible to monitor all locations where beam loss is predicted. Vacuum distribution can be measured based on BLM count rate.
Coincidence counting make it insensitive to synchrotron radiation.
The charged particle crosses both PIN-diodes, which causes a coincidence. Synchrotron radiation photons , if stopped by the first PIN-diode, do not cause a coincidence. Bergoz was granted a license to use DESY's original development.