The condition of the EG&G 5210 phase lock/frequency lock amplifier is as shown in the picture. It can be turned on when it is powered on, and the buttons have feedback. Since I am not a professional, professional testing does not know the current situation and is sold. It will not be returned or exchanged after it is sold. If you need it, you can also watch the operation on the screen. I’m looking forward to buying it for $500.
裕翰實業 
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