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The Digital Meter Adapter adds a digital display and other functions to any compatible Analog Geiger counters. Compatible Analog Geiger Counters have a TTL pulse output. The DMAD has three functionalities to enhance the capabilities of Analog Geiger Counters. It counts pulses from the analog Geiger counter and converts the reading into an approximate radiation level. Both count data and radiation level are displayed on the LCD display. Has a serial output that is compatible with Images USB-TTL cable interface. The serial output and USB cable may be used with Images SI Inc.'s free radiation monitoring and graphing software. DMAD Functionality Countable Pulse Resolution & Range 1 Count Per Minute (CPM) – 9,360 Counts Per Second (CPS) Radiation Resolution & Range 1.0 uR/hr – 655 mR/hr (Metric) .01 uSv/hr – 6.5 mSv/hr Random Number Generator Functionality This adapter plugs into the digital out of the analog geiger counters and provides a random number each time a radioactive particle is detected. The geiger counter is set up to read background radiation. The random numbers generated are truly random since they are based naturally occurring radioactivity. The random number generate may be set to the following ranges: 1-2, 1-4, 1-8, 1-16, 1-32, 1-64 and 1-128 9 Volt battery powered. Battery not included. Images SI Inc., manufacturing electronic instruments and kits for over 25 years.