Hottest TV 800 Continuity tester with 200 mA according EN 61557-4 The Testboy® TV 800 continuity tester is a device for testing the continuity resistance of a cable or connection using test current delectable 200 mA, according to EN 1557-4. A voltage test up to 300V AC/DC is also integrated, as well as the calibration of the test leads. The integrated LED serves as a flashlight or as an optical signal during continuity testing.