Considering Mars' mean atmospheric pressure of 610 Pa (0.088 psi) its "sea level altitude", how high went the highest probe/rover that ever successfully landed on Mars so far (respectively, what's the lowest atmospheric pressure a probe on the Martian surface has ever been in), and how low/deep the lowest one (or what's the highest pressure a probe/rover has been in)?
I combed through Wikipedia's list of Mars missions and found all of the successful landers/rovers and included the Chinese Tianwen-1 though it has not landed successfully as of this answer. I got the elevations using Google Earth Pro which has an option to view Mars and uses MOLA data from the Mars Global Surveyor. I cross-checked the InSight one with the official value from 2018 MARS INSIGHT TRAJECTORY RECONSTRUCTION AND PERFORMANCE FROM LAUNCH THROUGH LANDING and it was correct:
|Spacecraft / Mission:||Latitude (°, N+):||Longitude (°, E+):||Elevation (m)||Visible on Google Earth Pro?|
|Spirit / MER-A||-14.5684||175.472636||-1945||yes|
|Opportunity / MER-B||-1.9462||354.4734||-1373||yes|
|Curiosity / MSL||-4.5895||137.4417||-4447||no|
|Perseverance / Mars 2020||18.4446||77.4509||-2564||no|
Wikipedia also has this nice graphic: