The M3 series combines 3 microscopes in one! The M3 allows you to view both microscopic specimens, by using the compound objectives (4X, 10X, and 40X), and macroscopic specimens, by using the 1X macro objective. It is cordless, using energy efficient, rechargeable LED illumination, and compact so it is ideal for both classroom and field work applications. Through the unique configuration of objectives, the M3 achieves a magnification range of 10X-400X. Switching from compound to macro use is easy to accomplish by changing the objectives and adjusting the stage positions. All metal construction makes it durable for use in any environment. The unique tripod base keeps it sturdy even on rugged outdoor surfaces. OPTICAL SYSTEM Widefield 10x /18mm eyepiece. Monocular viewing head with 45° inclined eyepiece. DIN standard 4x (0.10 N.A.), 10x (0.25 N.A.), 40xR (0.65 N.A.) achromat objectives, and 1X Macro objective. Quad objective turret is ball-bearing mounted for smooth, precise positioning of objectives. ILLUMINATION LED light rated up to 50,000 hours of life. Batteries allow up to 500 recharges, for a total of 20,000 to 25,000 hours of use. Battery charger included with microscope, automatically shuts off when batteries are fully charged, no danger of overcharging batteries and shortening battery life. No expensive recharger station needed/ Plug directly into wall outlet, or use ordinary, inexpensive power strip for recharging multiple microscopes. Indicator light changes from red to green when fully charged.