How Fast The How Fast is the simple, easy, and inexpensive way to measure your model's airpeed. It provides at-the-field readings right after your flight. Precision Instrument 24 to 800 km/h airspeed 1 km/h resolution Uses the same differential pressure sensing as full-scale aircraft (Pitot tube). A Complete Airspeed System No interface, computer, or additional equipment needed Includes Pitot and static probes that mount in the wing Tiny, lightweight (2.7 gram) circuit board Plugs into your receiver or any 3.2V to 12V battery Simple to Use Light Emitting Diode (LED) used for communication Wave your finger over the LED for maximum airspeed report Simply count the flashes: flash flash-flash flash-flash-flash = 123 KPH View Instruction Sheet Price: (USD) $48.60 Shipping from: $1.76 In stock now