wedge

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A step wedge or other standard's pieces should be purchased, and the x-ray machine should be tested regularly by security personnel.
6) Combinations turntable step wedge and measuring precision timer for radiographic equipment (2 Unit)
The printing form contained different printing elements: standard CMYK step wedge in the range from 10-100% tone value, standard ISO illustration for the visual control, textual positive and negative microelements, wedges for determination the greyness and the standard wedge with 378 patches for production of ICC profiles and 3D gamut.