The Jonard PT-350 replacement speaker is designed for use with the Jonard PT-300 pocket continuity tester and toner. The speaker emits an audible signal when a test tone is detected. The speaker attaches to the end of the tester for storage.

Jonard Industries manufactures hand tools for telecom, fiber optics, and electronic industries. The company, founded in 1958 and headquartered in Tuckahoe, NY, complies with Restriction of Hazardous Substances (RoHS) directives.