Haefely Test AG  -  Tettex Instruments (click for more details)          Precision. Swiss Made. Since 1904 Haefely Test AG is market leader in various high-voltage test products including the test, measurement and diagnostic equipment for a wide range of electrical applications. Test systems for laboratory, factory and field use are available. Haefely a single source supplier unifying powerful resources from design, development, engineering, marketing and support - from high-voltage design over electronics to software in one company. Haefely & Tettex Products

Hipotronics, USA (click for more details)  Hipotronics, Inc. is the world's leading full-line manufacturer of high voltage test equipment and measurement instrumentation. Hipotronics Products

Sefelec, France (click for more details) Leader in the field of safety tester and cable tester, SEFELEC designs, develops and manufactures a diversified range of measuring instruments (from microhmmeter to hipot tester, dielectrimeter, ground bond tester, safety tester, leakage measurement tester), test systems (from cable tester to harness tester, backplane tester), and very high voltage hipot testers, very high voltage power supplies, high current sources. Sefelec Products