#222LED -Bulbs 222LED replacement E10 Miniature, Mini screw, Lamp, 2.2v, .25amp. This #222LED miniature light bulb replacement commonly used in magnifiers, loupes, microscopes, flashlight pens, etc. This model will fit many of our Electro-Optix models, including our popular M-7series, M-70, MP-8, MP-10,MP-12, MP-14, TM-7, TM-8, our reticle magnifiers and our Nitewriter Pens. Also fits eschenbach models, 1571,1572,1573,1575 and Bausch & Lomb lighted pocket magnifiers. Each purchase is for 1 Bulb Please note that with some models you may have to reverse the batteries for the bulb to work in your device, this is because LED Bulbs are single pularity.