Abstract: The small tester is hand held by the writing pen body (21) when testing vibration with a housing mounted vibration probe (15) mechanically driving a piezo element (12), acted on by weight (11). The piezo element (12) has electrical connection (13) through an electronic circuit to an electronic display (22) indicating predetermined levels of vibration amplitude. The multi-level LED display (22) consists of four different colored LED's where illumination of a specific colored LED indicates a specific predetermined level of vibration amplitude. The electronic display (22) changing illumination of specific LED's from the lowest indicated level of vibration to just reach the highest indicated level of vibration is a nominal 6 dB increase in vibration amplitude at predetermined frequencies.

Abstract: The small tester is hand held by the writing pen body (21) when testing vibration with a housing mounted vibration probe (15) mechanically driving a piezo element (12), acted on by weight (11). The piezo element (12) has electrical connection (13) through an electronic circuit to an electronic display (22) indicating predetermined levels of vibration amplitude. The multi-level LED display (22) consists of four different coloured LED's where illumination of a specific coloured LED indicates a specific predetermined level of vibration amplitude. The electronic display (22) changing illumination of specific LED's from the lowest indicated level of vibration to just reach the highest indicated level of vibration is a nominal 6dB increase in vibration amplitude at predetermined frequencies.