While the main board has ESD protection on all of its external inputs, the meter probe does not have any. Thus, it is possible that incorrectly touching the plug while handling a disconnected probe could cause an issue.
It is probably good practice to add ESD protection components to this PCB, right near the wire-to-board cable connection. However, more research on the design of similar devices is likely to be a good idea.
While the main board has ESD protection on all of its external inputs, the meter probe does not have any. Thus, it is possible that incorrectly touching the plug while handling a disconnected probe could cause an issue.
It is probably good practice to add ESD protection components to this PCB, right near the wire-to-board cable connection. However, more research on the design of similar devices is likely to be a good idea.