Photoelectronic Sensor is a non-contact and penetration type safeguard which protects workers from the dangerous area of Drop Shock tester.If a photoelectronic sensor detects workers and things during starting of test equipment, it will enable control of repealing fall operation by interception of light, and will prevent an accident. Moreover, a worker's operation is not barred by using Photoelectronic Sensor. Feature 1.Comparatively, there is no restriction for detection.2. According to a setting position, about form and size will be manufactured by mutual agreement.3. It is detected as workers and things invading carelessly in area.