Features: - Measurement of vibrations : acceleration values (m/s/s) - Real-time display : horizontal direction - Two-axial vector plane graph, vertical direction - Time course graph. - 3-axis composite acceleration display (Compo) : Orange-line on Time course graph. - Peak level display (Peak) : includes maximum acceleration values in Gal units. - Switching of sensor sampling period (Fast/Slow) - Measurement timer : 20 sec, 3 sec start delay for tap vibration stabilization. Notes: In general, there is variation and accuracy error by individual terminals and sensor devices of the iPhone, so this app does not recommend the use in the formal measurement. There is also a possibility that the accuracy error is accumulated if the vibration is too large, it may not be appropriate measurement display. During in car driving or operating machinery, please do not use this app for safety. Please visit our iOS app support page for more information on this app.