The TESA altimeter * two-way force measuring system ensures better stability and repeatability of the instrument. Its friendly human-computer interface, distinctive design of the TESA altimeter with programming function keys, and * functions provide users with an altimeter. TESA altimeter can measure height, depth, slot width, internal and external diameters, hole center distance, axis center distance, flatness, plane angle, perpendicularity, straightness, etc., which is highly practical. The objects to be measured can be displayed on the console without manual calculation. The measurement results to a large extent exclude the influence considered. The TESA altimeter can correct the error of the system, regardless of the height, side perpendicularity and straightness, which greatly improves the measurement accuracy. When measuring the round surface, the altimeter can automatically search for the turning point, which can save a lot of unnecessary time.