Quantum Devices, Inc. | Optical Encoders, Light Therapy,Photodiodes The Quantum Devices product line includes application specific Silicon Photodiodes, Optical Encoders, Incremental Encoders, Rotary Encoders and Light Emitting Diodes (LED) for commercial, industrial and medical applications. QDI's photodiodes and LED's are used in instrumentation for photosynthesis and photobiological research, biomedical and medical instrumentation for measuring blood sugar levels (glucometer), oxyhemoglobin and pulse rate (pulse oxymeter). Quantumdev.com~Site InfoWhoisTrace RouteRBL Check