STRONG IMPACT RESISTANCE: Watch glass len is made of high quality mineral glass material, come with strong impact resistance,clear and transparent.
GOOD MAGNIFYING EFFECT: Flat back measuring cup lid come with convex surface and flat back, possess good magnifying effect.
HIGH TRANSPARENCY: Watch glass beaker cover has high transparency, easy to observe experimental result.Watch parts replacement surface is smooth without burrs, high temperature resistance, long service life
20PCS WATCH GLASS LENS: 20Pcs watch glass lens mineral convex surface flat back measuring cup lid diameter range approx. 16 ~ 25.5mm / 0.6 ~ 1in,sufficient quantity and diverse sizes to meet your various needs.
WIDE APPLICATION: Watch glass can be used as an evaporating dish, watch lens accessories lid, container, carrier.