Easily find the center of a workpiece with these rulers that have special zero centered measuring scales. Simply position the ruler so that you have the same reading on both the left and right sides of the workpiece. The center of the workpiece will be located at the zero mark on the ruler.

Calcium fluoride windowprice

Calcium fluoride is often used in spectroscopic windows and lenses due to its high transmission from 250nm to 7μm. Its low absorption and high damage threshold makes it a popular choice for excimer laser optics. Calcium fluoride’s low index or refraction allows it to be used without an anti-reflective coating. The Knoop hardness of calcium fluoride is 158.3. TECHSPEC® Calcium Fluoride (CaF2) Windows manufactured from vacuum UV grade calcium fluoride are commonly found in cryogenically cooled thermal imaging systems.

Historical Model #s: 1034, 1034A, 1034R, 1034A-18,1034A-18A, 1034R-18, 1034R-18A, 1034A-24A, 1034R-24, 1034R-24A, 1034A-36, 1034A-36A, 1034R-36, 1034R-36A

An excellent tool for woodworking, carpentry, graphic arts, crafts, metal working and any other application in which it is necessary to find the center of an item.

Calcium fluoride windowvs caf2

Available in 18”, 24”, and 36” overall lengths. The 36” length reads from 0”-18” to the left and 0”-18” to the right. Select the reading you require to the left or right by dividing the overall length by two.

A two sided ruler featuring inch scales to 1/16" on the front. One edge is zero centered for use as a center finder and the other for use as a regular measuring scale which reads from left to right. The back of the ruler features metric scales in cm and mm. One edge is zero centered for use as a center-finder and the other for use as a regular measuring scale which reads from left to right.