Chequing a pickup works well

[Music_for_life]

I use a key and touch the poles of each pickup, is this ok??
Doing this constantly can damage the pickups?

[Music_for_life]

....

[62bass]

I've done the same thing when checking to make sure the wiring was correct after installing a pickup and before putting the strings back on. Doesn't hurt a thing unless you really work at it and try to damage something.