XTOOL AD20

I bought 3 of these devices - one for each vehicle, and leave them plugged in at all times. They pair easily with my Android smartphone and when a car is started they perform a basic check of all systems and let me know whether (or if) any problems require attention.

Highly recommended and for the price you can't go wrong.

For only $20 this little reader rocks. Easy to pair with your vehicle and phone, the app works great, quickly read your codes and start making repairs.

The real-time diagnostics are pretty sweet too, just don't crash your car or get a ticket playing with the features lol.

I really liked the price of this. It works! It will scan obd2 codes and clear them on several different cars of mine and my family. Bluetooth had decent range also with my iPhone. It was easy to pair with the app. I would not expect all the data to be reliable all the time and definitely do not leave it plugged in while you go shopping. However for the cost/value it is still a good buy. Excellent customer service from Xtool also.

installed it right away. installation is easy. just plug into the OBD2 port, download the app, turn on the car. I got all the info(including battery power) showing in the app. The device itself is a very small dongle plug into OBD2 port. I am using it to monitor my car's battery power, since I park it most of the time in the garage. I also use it to monitor my RV's O2 sensor.
I like the size of the device(being so small), and easy monitoring from my iPhone.
The only wish is that if it can update the code will be wonderful, but for the price, it is a stretch.

It works well on newer cars but something with a little age on it all i could get it to do was read codes. It would reset most of the faults. Was easy to use and the app is friendly.