Testo-0563-4770-LED-H&-Held-477-Stroboscope-Tachometer-Testo-05634770-P-The-Testo-0563-4770-is-a-477-LED-H&-Held-Stroboscope-Tachometer-that-measures-rotations-&-vibrations-&-facilitates-measurements-during-operation-P-P-Normally-the-Testo-477-is-used-when-the-aim-is-to-show-fast-moving-objects-in-slow-motion-In-this-case-you-can-analyze-their-movement-securely-&-smoothly-check-for-proper-procedures-&-determine-undesirable-sources-of-vibrations-etc-P-P-You-can-also