Stainless steel made External Pistol Caliper is used to determine wall thickness of pipe or tube. Featured with 230 mm to 350 mm port dimension range, this instrument is perfect alternative of varnier caliper and micrometer for measurement of hard to reach areas. Tungsten carbide made measurement tip of this instrument has spherical radius that helps to avert its wear. Special types of channels have been used to design its arms in order to reduce its weight. It has up to 50 mm measurement range. Analog based display method, industrial application, precise shape and user friendly mechanism are the key aspects of this product.