Check the listing for details. United Instruments Vertical Speed Indicator P/N 7000. Condition: Used, Made in United States. Listed at 150.00 USD. The United Instruments Vertical Speed Indicator P/N 7000 is a part manufactured by United Instruments in the United States. This aviation accessory, though not under warranty, provides accurate vertical speed readings for aircraft, making it essential for maintaining safe and efficient flight operations. With this product, pilots can rely on precise measurements to ensure smooth and controlled descents or ascents during their flights.