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Tracer Products says its Cobra-4 and Cobra-6 multipurpose borescopes feature interchangeable blue- and white-light LED flashlights that enable technicians to inspect and leak-check hard-to-see ...

Blue light is a shorter-wavelength colored light found in everything from traditional light bulbs to computer and smartphone screens. Blue light is good for your body during the day, but at night blue ...

After two months of carrying this flashlight every single day, it's never turned itself on. The lock works, and works great, ...