JARblue

There are going to be different features of course, but the main difference between the $30 and $80 bluetooth units is going to be the amount of data it can transmit. You may find that the cheaper unit is not capable of displaying data from every sensor you want all at the same time. And you may not be able to log as much data at the same time. But if you are just looking for some basic readouts on Torque and not much more, the cheaper unit would probably suit your needs just fine. Then again you may find that the extra cost is worth it for the nicer unit.

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