s: Accessory Type: Test Clip Insulator ; For Use With: BU-60 Series Test Clips. DSOX3BW12 : BANDWIDTH UPGRADE FROM 500 MHZ to 1 GHZ ON 3000 X-SERIES 2 CHANNEL MODELS. s: Accessory Type: 1GHz Bandwidth Upgrade ; For Use With: InfiniiVision 3000 X-Series 2 Channel Oscilloscope Models...