ScanMaster had a "Pro" version that supported (Parameter IDs)—things like transmission fluid temperature (Ford) or battery state of charge (Toyota) that generic OBD-II didn't cover. This was the killer feature. It blurred the line between a $40 hobbyist tool and a $1,500 Dealer-level scanner. Part IV: The Fracturing & The Imitators But as Android and iPhone smartphones exploded, the laptop-in-the-garage model began to feel clunky.
Diy mechanics realized they could graph their long-term fuel trim while driving, spot a failing mass airflow sensor, and fix it for $150 instead of paying a shop $800 for a new catalytic converter they didn't need. scanmaster elm327
By J. Hartley, Automotive Tech Correspondent ScanMaster had a "Pro" version that supported (Parameter