Greetings All, I am looking for a bunch of Ludlum Model 177's. Please call or email if you have any extras to sell or trade. Thanks, Rob Robert J. Gunter, MSc, CHP CHP Consultants/CHP Dosimetry www.chpconsultants.com www.chpdosimetry.com Toll Free: (888) 766-4833 Fax: (866) 491-9913 Cel: (865) 387-0028 rjgunter at chpconsultants.com