Offered for bid is a 3 1/8" Instantaneous Vertical Speed Indicator (IVSI). Manufactured by Teledyne Avionics. P/N: SLZ9244, SN: BT2156. Pressure static instrument with 6-pin connector for internal illumination. The instrument is in excellent condition and was stored in a dry, temperature controlled climate. Former commercial airline item. Overhauled by Barfield Instruments. Includes work order and serviceable tags and paperwork. The item was purchased a couple years ago during a liquidation sale. Thank you for bidding. Buyer pays 13.75 shipping.