Handling Schematics in Cold Weather Can Be Awkward Testing solenoids valves and relays in extreme cold weather has been a problem for voltmeters. Schematics can be awkward to read and check in cold weather when unfolded. The non- contact Bartol MagProbe can be utilized without relying on schematics to trace contact points or accessing terminal strips. [email protected] Business 208-321-7566 99% faster Than a Voltmeter Fax 208-378-1282