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Tin Side Testing Device
Description

The Tin-sided Testing Device is very helpful in identifying the tin side of glass.

 

Putting light side of device against the glass, when there is the tin surface, device light will make tin fluorescent and make tin produced a milky white image which is visible to human eyes; when there is the Non-tin surface, nothing but only the duller image of UV light can be seen.

 

It is suggested that the device should work in natural light.