Profile: Crystalaid Pty. Ltd. produces, repairs & services custom fitted hearing aids and hearing instruments. Our manufacturing divisions are accredited to ISO 9001 & ISO 13485 quality systems. We offer digital hearing aids & high powered behind the ear models. Our product line includes ear canal hearing aids, spectacle hearing aids, earmolds & ear fittings & thermogenic apparatus. We also supply custom made hearing instrument earpieces and ear molds, as well as hearing protection devices. We provide technical service division & ear mold laboratory for the hearing instruments. The button type batteries are used in hearing instruments & it can be tested using battery tester.