PREISSER Precision Straight Edge - with Bevel Edge
Straight edges are used to check if a surface is flat and straight. This one from Preisser is made of a special, hardened, steel alloy, and tapers to a point at one end. The edge is slightly rounded off, to help keep it from getting damaged, and to prevent it from cutting or marring the surface one wants to check. The straight edge is burnished to be glare-free and to avoid reflections but not stainless.
To use, the measuring edge is set on the surface to be examined. With back light, even the slightest gap or unevenness can be seen. Under favorable lighting conditions, one can detect a gap smaller than 1/100th of a millimetre.
Preisser manufacturers the straight edge to the DIN 874 GG-00 standard (German industrial standard), which works out to be 3/1000 of a millimetre. The back of the straight edge is covered with a strip of ridged plastic to provide a secure grip on the delicate instrument and to protect the hands in cold weather. The straight edge comes with a vinyl case. Picture: the 150 mm long straight edge.
||Cross section mm
||22 x 6
||30 x 7