Check this link before you buy
http://www.act-labs.com/black-box/
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Black Box V1
o Data logger
o Dual low-battery monitors
o Effortless calibration of sensors
o On-screen display (OSD) configuration options
o 6 character OSD text display for HAM Call signs
o Airspeed measurement (~18 - 115 mph)
o Altitude measurement (0 - 1000 ft)
o RPM measurement (40 - 65,000 RPM)
Black Box V1 is a R/C telemetry unit with a USB interface to connect to a PC.
Black Box
measures altitude, air speed, propeller rpm, and battery voltages.
o It is also a data logger that stores flight parameters for post-flight retrieval, viewing and archiving.
o Key applications inlcude
Lightweight and compact design suited for use with any R/C plane or helicopter.
o Priced for mass market acceptance.
Warning : NTSC ONLY, not compatible with PAL
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