Safety Pen & Black to red UV Pen
Testing: blacklight, UV 365-385.
How to use: It can be written on any white paper. Turn on the ultraviolet light, if the appearance of the black ink mark of the tested object change in hue from black to red.
Price (Not including the shipping cost) : one pen $15 USD
one refill $11 USD
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Invisible UV Pen
Testing: blacklight, UV 365-385.
Suitable for use:
Skin, paper, cloth, leather, wood, plastic, pottery.
Colour: Invisible to red, Invisible to yellow, Invisible to green, Invisible to blue, Invisible to Violet, Invisible to orange, Invisible to white.
Price: one pen $7.99 USD
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