Available FREE to a good home. Instrument calibrator containing certified 9.36-millicurie sealed source of radium-226. Shielded design with hydraulic height adjustment. Shutter can be electrically operated from a remote location. Calibrate instruments with dose rates up to 200 mr/hr. Contact: Donald Rhodes 345 William Pitt Way Pittsburgh, PA 15238 (412) 826-5460 DonRhodes@Compuserve.Com