Testboy-15-Magnetic-Field-Tester-Testboy-Testboy-15-P-The-Testboy-15-is-a-Contact-Less-Magnet-Field-Tester-that-is-particularly-suitable-for-rapid-and-precise-testing-of-electro-magnetic-switches-and-valves-The-method-used-for-the-measurement-process-has-significantly-simplified-test-procedures-in-all-pneumatic-and-hydraulic-systems-P-P-The-illuminated-tip-displays-all-permanent-direct-and-alternating-magnetic-fields-The-Testboy-15-is-so-sensitive-that-covers-or-panels-do-not-need-to