Check the listing for details. Tektronix Model 7A18 Dual Trace Amplifier Plug-In.. Condition: Used. Listed at 89.00 USD. Tektronix 7A18Serial Number: B127322 Comes from a retired calibration laboratory, inventory says "Good". Missing knob. No tests preformed. Sold as-is. If you have any questions regarding this item, please contact us-before-buying. Please Note the following: No power cord, software, batteries or accessories provided unless stated. Please take the time to review the actual picture of the unit for extra reference on the item. This is the exact unit that will be shipped. It will be cleaned to the best of our ability. S&H : NO SHIPPING TO AK, PR, or HI without additional cost. Updated invoice will be sent after unit bought to those locations. Multiple items purchased will be considered for discounted shipping. Expedited shipping can be arranged upon request at an additional cost to buyer. All items will ship within 1-3 days of payment receipt. Local Pick-up is Available.Shipping will be well packed. WAREHOSE LOCATIONA-2-L