The mechanical standby airspeed indicator is a panel mounted, direct reading airspeed instrument. This silent companion provides the pilot with the traditional mechanical display that can be relied on to get home should all else fail.
Airspeed is displayed by a rotating pointer against a fixed scale in knots. The scale is non-linear and expanded at lower airspeeds for increased readability
Range of 60 to 450 knots depending on application
Certified to FAA TSO-C2d, RTCA/DO-160