Products HM3301 handheld variable optical attenuator for the installation, operation and maintenance of fiber optic network specifically designed for a precise, durable and portable instrumentation. Has a compact size, the selectable switch the backlight display function, ultra-wide optical attenuation range, the accurate attenuation accuracy and user self-calibration function and a common interface design, the attenuation value through the LCD display. Performance parameters Instrument Model HM3301 attenuation range (DB) A Type B 0-300 to 60 Uncertainty ± 5% Operating temperature (° C) -10 to +60 Storage Temperature (° C) -25 to +70 automatic shutdown time ( min) 10 battery working time is not less than 48 hours Overall Dimensions (mm) 190 × 100 × 48 power rechargeable lithium battery weight (g) 400 Description Product Features: 1. rechargeable lithium battery for up to 48 hours continuous work time. attenuation value adjustable LCD display corresponding attenuation values ??4 unique FC / SC / ST common interface without complex conversion 5. optional automatic shutdown function. optional on / off backlight display standard Configuration: user manual, product warranty card, certificate, AC power adapter, cleaning swab, desiccant, Oxford cloth soft pack transactions welcome new and old customers come asking price Order. . .