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The TiltWatch XTR is single-use tip indicator used to
monitor goods that must remain upright to insure intact
delivery. The device continual monitors shipments and
does not activate until it is at an 80° angle +/-5% from
vertical along a single plane.
http://www.shockwatch.com/monitoring-devices/blog-tip-tilt-sensors/tilt-indicators/tiltwatch-xtr/