Features:

• With the line division value,it is intuitive and easy to calculate the error of straightness and flatness.
• This instrument is simple in design,therefore it is convenient to carry,and can be used in various condition.
• With bright cross-line in dark field of view,a clear image and easy reading are obtainable.
• Combining with optical square which uses pentaprism and reflecting mirror with magnetic holder,the instrument can measure the error of strainghtness and squareness between guideways which are vertical to each other.
• It can easily catch the reflecting,image from far distance by using optical viewfinder combined with the level adjusting plate.
• It is capable of measuring the straightness separately in both vertical and horizontal directions by rotating the eye piece 90°.