you would think they got it right,unless the guy was a complete braindead stoner or he has never done it before. theres a possibility it used a different fluid. like mine uses a 6.86 instead of a 7.01 fluid to calibrate. get the liquid drops for backup and additional testing. get right calibration fluids. calibrate yourself, should beable too

also sometimes it takes more than 1 time to calibrate right and maybe something freaked out on the meter while calibrating it.

also any time the ph meter sits for a while or battery goes out it should be calibrated/checked to be safe it is working properly