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In all cases location markers which indicate the diagnostic length (extent of the weld on the film to be examined) must appear as radiographic images. The repair status of the weld should backtrack 5 full tutorial be shown, usually by markers R1 (repair), R2 (second repair) etc. The blackness or density of the image can be assessed by comparison with a tutorual strip having cull range of density values. A more accurate method is to use an electronic device known as a film transmission densitometer. This device simply measures the logarithmic ratio of incident to transmitted light through the image from the viewer. Film density is therefore a number which will vary from 0 (film totally transparent) to about 5 (film virtually honda rebel 250 performance.