Thank you for those who responded to my request. I received information from three companies who manufacture low BG LSC and I would like to share this info. They are: Packard, Beckman, and Wallac. M. Jo Myung Chul Jo, RSO <mjo@scs.unr.edu> EH&S/MS 328 University of Nevada, Reno Reno, NV 89557 (702) 784-4540(voice) (702) 784-4553(fax)