We offer a compact and versatile instrument for linear measurement which has a pre-focused objective and is therefore, suitable only for flat objects. The measurements are directly read on glass scale incorporated in the eye piece. The reticle is calibrated in 0.1 mm units over a range of 7 mm and the diameter of microscope field is 8mm. This microscope has a magnification of 25x which allows the user to measure the diameters of indentations made by the ball indenters of all brinell type hardness testing machines. This microscope is also easily used as a calibrated portable microscope and is supplied with 7w- 220v lighting attachment.