This is a high speed and high sensitive PIN photo diode in a miniature flat plastic package. Due to its water clear epoxy the device is sensitive to visible and infrared radiation. The large active area combined with a flat case gives a high sensitivity at a wide viewing angle. In the present setup, the photo-diode characteristics in forward bias and reverses bias configuration for fixed irradiation is measured. Also, the dependency of photo-current on different irradiation will be measured.