A magnifying glass (called a hand lens in laboratory contexts) is a convex lens that is used to produce a magnified image of an object. The lens is usually mounted in a frame with a handle (see image).
A sheet magnifier consists of many very narrow concentric
ring-shaped lenses, such that the com..
4 wire resistive touch screenFEATURESSuperior quality standard 4 wire resistive analog touch panelExcellent specification and high qualityAnti Newton ring technologyHigh-reliability materialsPen/finger typeTransparency - 80% typicalELECTRICALRated Voltage: DC 5V max.Resistance X axis: 300 to 850 Ω (..