Ultra violet in safe-box (longwave + shortwave + white ) Gold testing kits (complete sets - including Silver testers) changing most watch batteries /

changing most watch batteries / straps

5% false negative rate) providing the colour is 'clear' (colour D to J) and the size is at least 0

Needles of gold of known purity (carat) for use with a touchstone: 8ct

Useable diameter of this lens (allowing for the rim that holds the lens in place) 18mm

Ultra violet in safe-box (longwave + shortwave + white ) Gold testing kits (complete sets - including Silver testers) changing most watch batteries /Summary Shortwave UV light in a 'safe' box (to stop the light burning your eyes and a longwave UV light and an ordinary white light. For examining gemstones, stamps and other small objects. It can also be used for sterilising small items of jewellery to make them safe from viruses but please read the explanation first. Can be switched to UV longwave, UV shortwave, or white light. To see the reaction under these three different lights it can also be