This reports the largest variation in round-trip time observed between consecutive ping replies during a single ping test, measured in microseconds. Admins compare it to the minimum and average jitter values to spot how spiky a link's latency can get, since occasional large jitter bursts can still disrupt sensitive traffic even when the average looks fine. A max jitter reading of 8000 microseconds on an otherwise low-latency link would flag intermittent congestion worth investigating before deploying real-time applications over it.