The Perfect Handhold Tester Series Optical Variable Attenuator TW3303 TW3303 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) Application Telecom Maintenance CATV Maintenance Comprehensive cable construction system Optical instruments research and development Optical communication education and lab testing Other optical project Features Stepwise attenuating by circumgyrated dial: Attenuating step 0.05dB Provide with the function of displaying dB and dBm attenuating value Alternative function of 10 minutes Auto-off without operation After off the instruments, the system will have the memorizing of the