YU CHING is a leading Digital thermometer and optical power meter manufacturer specialized in digital thermometer, LAN cable tester, optical power meter, variable attenuator, laser light source, led light source, laser power meter, fixed attenuator, humidity temperature meter, and thermometer data logger. We are dedicated to the design and manufacture of laser pointers and associated products among other items. We have expanded our R&D of photoelectric products, including optic-fiber power meters, CD meters, laser power meters, fixed and variable attenuators. We welcome OEM and ODM. Please contact us any time and we would be pleased to serve you.