HP 1820C time base plugin with origianl operators and service manual. The plugin is not tested but appears to be complete. For some reason someone has drilled a hole in the side. This in now way affects the functionality of it and it cannot be seen when in the scope. It is missing the insert for the trigger holdoff knob. The manual is complete and in good condition with the exception of a couple very minor stains on the covers. From a smoke free home.

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HP 1820C time base plugin with operators and service manual 01820-90906