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I have some buzzers, which have a label on them, which states "HSDZ REMOVE SEAL AFTER WASHING". I know that washing is the process of removing residues of flux or something else with solvent. However, I can't find anything about HSDZ. What does it mean? Some buzzers on the internet have HYDZ instead. What do those letters mean?

Saren Tasciyan
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There seems to be lots of different clusters of letters out there, and some have none at all. As far as I can tell, this isn't a specification or a message of some sort.

Presumably it's something as simple as the initials of the manufacturer.

Buzzer Pictures With Different Letters

Tom Carpenter
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  • Ok, I have just found out this: https://www.alibaba.com/product-detail/THDZ-KC12095-Passive-active-Electromagnetic-Buzzer_770455482.html there it is referred as "Model". – Saren Tasciyan Sep 20 '20 at 13:21