Rectangular profile 40x20 mm made of special hardened alloy hot that ensures rigidity and lightness. Anodization treatment which makes it scratch-resistant and corrosion-proof, with hardness of 250÷350 HV. Sliding guides made from ø 6 mm steel rods hardened and ground. Prismatic sliding guides in order to reduce the game and friction. Measuring surfaces for outside and inside measurements made of stainless steel, hardened and ground, firmly integrated in to the structure of the jaws. Read the measurement on large digital display with resolution of 0,01 mm, new inductive technology resistant to moisture (WATER RESISTANT) with possibility of linear correction. Preset functions, transformation mm/inch, setting “zero” in any position of the scale, OPTO-RS232 data output.