Spektrum SPMA9589 Aircraft Telemetry Variometer Sensor Servo Programmer Adjustable 4mm steel toe and

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Spektrum SPMA9589 Aircraft Telemetry Variometer Sensor Servo Programmer Adjustable 4mm steel toe andSpektrum SPMA9589 Aircraft Telemetry Variometer Sensor The variometer is a telemetry sensor for sailplanes that indicates the rate of ascent and descent via an audible tone using select Spektrum transmitters*. This provides an indicator to the pilot when the sailplane is in a thermal of rising , or sinking air. By knowing when the sailplane is rising or sinking, the pilot can keep the sailplane in rising air and out of sinking air providing longer