Benchtop Meters LUDLUM Model 3276Area Monitor Controller LUDLUM Model 3277/1Alpha-Beta Frisker LUDLUM Model 177Benchtop Counter LUDLUM Model 177-50Benchtop Counter LUDLUM Model 177-56Alpha/Beta Benchtop Counter LUDLUM Model 177-61Benchtop Counter LUDLUM Model 177-84Alpha-Beta Benchtop Counter LUDLUM Model 4600 SeriesMulti-Detector Benchtop Counter