Instruction:This hardness tester is designed to easily measure the Brinell hardness value of different ferrous and non-ferrous metals including crude or annealed steel (non austenitic steel only), quenched and tempered steel (non austenitic steel only), cast iron, brass casting, rolled brass, rolled cooper, alloy of tin and bronze and casting of aluminum alloy.It can determine the Brinell hardness by measuring the diameters of the indentations left on the test piece and the standard hardness test block. The indentations are obtained by the steel ball of the tester located between the piece and test block with an instant load applied by hammer. The Brinell value can be obtained by referring the attached Conversion Table after measuring the indentations by the readout microscope.Widely used in shop, material supplier, plant, and quality control due to lightweight, easy operation and convenience. Wooden carring case is included.Specifications:Measuring Range: less than 450HBSDiameter of Steel Ball: 10mm (0.4")Readout Microscope:Objective Magnification:1XObjective Focus:31.48mm (1.24")Eyepiece Magnification:20XEyepiece Focus:12.6mm (0.5")Microscope Magnification:20XWorking Distance:62mm (2.44")View Field Diameter:9mm (0.35")Effective Measuring Range:6mm (0.24")Eyepiece Division Plate Value:1mmEyepiece Division Plate Scores:6 linesMeasuring Accuracy:0.01mmDimension:70X50X155mm (2.76X1.97X6.10")Weight:2 LBBrinell Hardness Test Block:Dimension:12X12X150mm (0.48X0.48X5.9”)Weight:0.17kg (0.37lb.)