Bluedot Trading jewelers-loupe-30x-60x 2 in 1 30 x 60x Magnified Jewellers Loupe, 2 in 1 30 x 60x Magnification SMALL METAL LOOPS: allows attachment to keychain or necklace. 2 LENSES IN 1 LOOP: 30x magnification with 22mm (.87 inch) lens ~ 60x magnification with 12mm (.47 inch) lens. BATTERIES INCLUDED: Lights use (3) LR1130 batteries (included) (also known as AG10, SG10, LR54, SR54, and SR1130). Batteries are easy to replace. MAGNIFIER SIZE: 3.54 x 2.76x 1.38 inch / 9 x 7 x 3.5 cm ( L x W x H) PLASTIC BOX SIZE: 3.54 x 2.56x 1.57inch/9 x 6.5 x 4cm( L x W x H) Compact and light weight. Folds into protective metal cover Made of high quality optical glass