No.238 Hearing Needle

Q/ZBF-238 Cold Drawn
This is an ideal tool to accurately judge and find out the problems upon the principal of sound transmission.
Black Sound Receiver

Number	L mm	Ф mm	Be-Cu g	Al-Cu g
238-1002	250	6	85	75
238-1004	300	8	150	135
238-1006	400	7	160	145
238-1008	500	10	335	305