Review on Advanced OBDII Speedometer KMH MPH Head Up Display with Battery Voltage, Engine Charging Voltages, Temperature & Overspeed Alarm - Perfect OBD2 Scanner for 12V Petrol Diesel Vehicles by David Sidman

Reads codes intuitively. However, if there are no codes, he may never tell you about it. He must never complete the process. Very easy to clear codes. It can display ECM data flow information. The monitor status will NOT show as N/A, OK, or INCOMPLETE. You'll have to borrow some to see if you can try a modern outlier test. I'm not sure if it can display SRS or ABS data. This is Chinese. The manual is stereotyped for Chinese to English translation. Easily customize display features, colors, and restriction levels. The speedometer can be calibrated in 1% increments. Believe me, there is an offset function for that too. The worst accuracy in my application was fuel economy. I wish it was right. I know my 2005 Wrangler doesn't get more than 50 mpg on the freeway. I haven't found a way to reduce this to a realistic value. My average MPG is generally 99.9. However, it paired well with the sensor in our 2015 Taurus. So it was bought to understand the MIL or to check the engine light. It worked as intended. Better than expected. I would buy it again given the circumstances. I might even buy it to use as a fuel economy gauge. While it wasn't exact, it was proportional. That means greater fuel economy should be higher than MPG.