Principle 1: light encounters card into heat, the temperature rises so that the corresponding portion of the color changes observed card;
2 Wavelength range: 850nm ~ 20000um, in theory, can be observed at any of wavelengths of light;
3 is extremely sensitive, 1mW laser above can be observed;
4 card-sized card with the same size, about the size of 50mm * 90mm
The photos show the effect after finger touching
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This product was added to our catalog on Tuesday 31 March, 2015.