TM 9-243USING A LEVELA level may be checked for accuracy by placing it on aknown level surface and noting the position of the bub-ble. Reverse the level end for end. Observe the positionof the bubble. If the relative position of the bubble wasthe same for both readings, the level is accurate.HORIZONTAL SURFACEPlace the level on a flat horizontal surface. Check thehorizontal vial (1). The bubble should be between thetwo etched lines on the vial. If it is not, the surface is nothorizontal.ANGLED SURFACEPlace the level on an angled surface. If the angle is 45degrees, the bubble will appear between the notchedlines on the 45 degree vial (2).VERTICAL SURFACEPlace the level against a flat vertical surface. Check thevertical vial (3). The bubble should be between the twoetched lines on the vial. If it is not, the surface is notvertical.10-3/(10-4 blank)
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