Rotate the right dial on the filar eyepiece to align the inside of the right measurement line to the right edge of the indentation. Press the READ switch on the lower right of the filar eyepiece once. The length dl is displayed on the display unit and fixed. Since Vickers hardness is usually obtained from the average length of the two diagonal lines, rotate the filar eyepiece 90o to align the measurement lines to the edges of another diagonal line of the indentation and press the READ switch again; length d2 is displayed.