Isomet limited produces toolmakers’ microscope, a robust instrument that simplifies accurate inspection of thread forms, form tools and complete contours. The work is supported over a glasswork plate whilst a beam of light transmits the image of the work-piece contour on to a line template within the ocular of the microscope. The worktable may be rotated or moved transversally or longitudinally for making angular or linear measurement. The linear movements are controlled by micrometer adjustments in conjunction with gauge blocks and are restrained by air brakes to prevent damage to micrometer spindles. Oculars are supplied for thread form and general contour inspection. The thread template oculars carry several ranges of thread forms and cross lines of the full thread angles and rotate through the line of vision of the eyepiece. An angular scale is also used in conjunction with thread template oculars for detecting errors in each half angle of thread form inspected. The protractor ocular carries a cross line surrounded by a full circular scale. A projection screen may be fitted over the eyepiece for use with all oculars. And transparent drawing may be mounted on the screen to serve as line template. A special scale is provided for preparing such drawings and making measurements on the screen. Each set comes with contour illuminator, surface illuminator, objective 4x, eyepiece 15x, vinyl cover, spare bulb [2 pcs], power supply: 220-240 vac and 0-360 degrees rotary worktable. Technical specifications: magnification: 30x standard 10x20x50x view field diameter: 10mm eyepiece protector: 360 degrees rotation image: erect working distance: 90mm maximum work height: 250 mm illuminators: 6.3v, 2w loading capacity: 20kg micro stage: 200x180mm; least count 001mm features sharp image easy to focus adjustable for optimum intensity varieties of accessories for versatile applications measures angle, threads and dimension