Epson M-Tracer MT500GII Golf Swing Analyzer Want to lower your score? Know the Impact Zone. Instant access to swing data  easily review data, including visual representations of each swing, through a convenient mobile app (iOS and Android) The Epson M-Tracer's patented 9-axis system delivers the accuracy and Impact Zone metrics you need. Measures Attack Angle, Club Path, Face Angle, and Club-Head Speed. The Epson M-Tracer unlocks the secrets for solid ball striking and makes for a perfect gift.