the only tool needed to troubleshoot a centrifugal chiller...
1. pocket screwdriver (preferably with a South pole magnet on the end)
much more than that and you are doing it wrong.
if you do what Henpeck suggested and watch the chiller tech that shows up, you can learn how they do it with a pocket screwdriver. if they use more tools than that, you may be over-paying them.
How to make the perfect "Half-Hitch" knot or any other boyscout knot in 3 easy steps...
1. Remove your meter leads from the meter and very carefully return them to their storage case or bag.
2. Wait 2 seconds
3. Very carefully remove your meter leads from their storage place and enjoy your new knot!