SPER Scientific Lab Pen Laser Pointer

SPER Scientific Laser Pointer, 3/8 X 5-1/2 In, 630 To 680nm Wavelength, Brushed Metal, Iiia Safety Class, 5mw Output Power, 1.3 Oz Weight, With Two Standard Alkaline Batteries, Used As Teaching Tool For Science Presentations, Conferences, Lectures, Seminars And Planetariums, Pen Shaped Unit Can Be Easily Carried, Projects A Brilliant Red Dot Clearly Visible, Runs For Minimum Of 4 Continuous Hours - SPER