The U.S. Army Corps of Engineers is organized geographically into eight permanent divisions, one provisional division, one provisional district, and one research command reporting directly to the HQ. Within each division, there are several districts.
Laser Safety Glasses - Holmium Laser. 1  On this page you will find our range of Holmium laser safety glasses , Ruby laser safety glasses, Dye and Erbium Laser Safety Glasses. 2  Important: Australian laser safety standards AS/NZS 2211.3:2002 require L-Ratings to be clearly marked on the laser glasses.
View Slides at Different Powers of Magnification with Minimal Effort. The SonlightÂ® Ultra Microscope comes equipped with 4X, 10X, and 40XR DIN glass objective lenses, giving you magnification powers of 40x, 100x, and 400x. All three glass lenses are housed in a single lens cluster that rotates smoothly in a greased ball-bearing collar.