Testboy-130-Magnetic-Field-Tester-Testboy-Testboy-130-P-The-Testboy-130-is-a-Magnetic-Field-Tester-suitable-for-fast-&-accurate-testing-of-electromagnetic-switches-&-valves-The-illuminated-tip-displays-all-permanent-direct-&-alternating-magnetic-fields-P-P-The-tip-of-the-130-is-so-sensitive-that-covers-or-panels-do-not-need-to-be-removed-from-machines-Functional-testing-can-be-carried-out-without-any-initial-set-up-or-stopping-of-machinery-P-Testboy-130-Magnetic-Field-Tes