The Perfect Handhold Tester SeriesOptical Variable Attenuator TW3303TW3303 Handheld Optical Variable Attenuator is used for continuously variable Optical signal attenuation. As the attenuator is used in the laser system for the on-line testing, there, thereforeTW3303 Handheld Optical Variable Attenuator can be used in the digital system of communication devices (such as: PHD, SDH) and also in the system of adopting analog modulation (CATV)ApplicationTelecom MaintenanceCATV MaintenanceComprehensive cable construction systemOptical instruments research and developmentOptical communication education and lab testingOther Optical projectFeaturesStepwise attenuating by circumgyrated dial: Attenuating step 0.05dBProvide with the function of displaying dB and dBm attenuating valueAlternative function of 10 minutes Auto-off without operationAfter off the instruments, the system will have the memorizing of the