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I found it from amazon
Launch CReader 3001,here shows $24.99
Launch Launch X431 DIAGUN IV,here shows $549

That price is big difference,how to choose it ?
Cheap ones work on minor applications and limited speed reading.

Depends what you use it for. In some applications, you need to read a LOT of CAN messages and some of these have great performance advantages. I use the one below (LX OBDLink ~$50) for my Tesla and the software to give me a lot of data about the battery, motors, regen performance, temp readings around several inside ports, temp on various parts of the powertrain system.

Obviously, it works on simple applications like the Volt too.

https://sites.google.com/view/scanmytesla/reccommended-adapters

 
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It can be so many things. Ability to read manufacturer specific codes (as opposed to just generic OBD-II codes), features, device quality, data logging, etc. would all contribute.

My advice is to decide on what features you need from a scanner and purchase the lowest cost model that has those features and the quality you want.
 

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I recommend you consider one of the adapters that allow OBD communication with an app on your cellphone. Lots of cool features. The adapters are sub $20 on Amazon and the apps range from free to about $5 depending on features. Get the Bluetooth version for Android, the WiFi version for iPhone.
 

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We do kind of have a recommendable short list of one that is both good and provides enough "upward expansion" to deal with someone deciding "I don't want to just look at things anymore -- I want to touch too."

http://www.vxdiagshop.com/wholesale/vxdiag-vcx-nano-for-gm-opel.html

That one, from that source, which is not going to come with pirated firmware and WILL work properly with the update tools.

And it's not even the most expensive out there.
 

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It depends. There's cheap ones that are pants and have poor software and speed.

There are counterfeit knock offs that are every bit as good as the originals and run the same software the OEMS use but cracked so you can do whatever you want with it and are probably factory seconds.

Best bet is to find out what others are using and recommend, especially if it needs something application specific.
 
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We do kind of have a recommendable short list of one that is both good and provides enough "upward expansion" to deal with someone deciding "I don't want to just look at things anymore -- I want to touch too."

http://www.vxdiagshop.com/wholesale/vxdiag-vcx-nano-for-gm-opel.html

That one, from that source, which is not going to come with pirated firmware and WILL work properly with the update tools.

And it's not even the most expensive out there.
Thanks for the link, Before I order one, I noticed that the download link for the GDS2 software doesn't exist anymore (dead link)
does this come with the software or have they changed how they use it??

Thanks for any help
 
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