TBSS and ProbSvr comparison Posted in Live Blogs on June 1, 2015 by Darrel Kingfield. ProbSvr climbed above 50% at about the same time a TBSS became evident: Issued a warning based on the TBSS signature in conjunction with the ProbSvr value quickly climbing (it reached ~80% with MESH of ~1.25″). Williams & MacGyver