software wideband

good morning,

what is the difference between a portable wideband to the wideband readings that already appear in some tuning software ( example : uprev ) I remember when data logged my 370z thru uprev , there was like a column with the air-fuel ratio readings. do I still need a portable wideband or that readings would be okay to reflash my ecu ?

thank you ,

Some tuners will want a known good well calibrated wideband sensor (one they will provide) while other ones go only with the OEM ones. I guess it's what you're comfortable using to gather your data!