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Built-in storage compartment for pen probe
loupes with UV lights
and each result has a characteristic bleep
Point it at the sky and see the lines that correspond to hydrogen burning in the sun and oxygen being absorbed by the atmosphere
Alternatives
Set of 11 diamond colour-grading stones by Gemoro Resolution_0.01g Built-in storage compartment for penDetails The only way to colour grade diamonds is to match the colours against carefully graded samples. Here are 11 carefully colour graded stones, 1. 00ct each, colours D to N. This set is unique in that it has 11 stones, and also because it has a built in UV light (with a USB rechargeable battery). Please note, these are colour grading stones for diamonds, they are not diamonds (they are Cz).