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The BARTOL MAGPROBE Instantly Checks Electrically Operated Solenoid Valves and Relays. It can Sense a Magnetic field as low as 3 Gauss without the Ring Magnet, 1 Gauss with the Ring Magnet attached. You can Test Electrically Operated Solenoid Valves and Relays while the Equipment is Operational, Use it Underwater, in a Vacuum, 40 below zero, and also in explosive areas. It is non-contact and very easy to use. Typically tests can be done in seconds. It is 99% faster in a volt meter. Over eighty thousand have been sold.