Siddhartha Heavy Equipment Ltd manufactures Vernier Callipers with Fine Adjusting Screws. Siddhartha Heavy Equipment Ltd is an ISO 9001:2000 certified company. The Vernier Callipers with Fine Adjusting Screws are used in length measurements to gain an additional digit of accuracy. The Vernier Callipers with Fine Adjusting Screws are available in capacity ranging from 150mm to 600 mm.