I've used PocketDyno+ many times and it has gotten great results, although I got it when it was only $5 now it's about $13. I've also looked at but haven't tried Torqued, which has a built in library of cars to choose from so you don't have to mess with finding the right weight, can't speak on its accuracy though. I would recommend trying the free version of PocketDyno it has many features from the pay version and uses the same technology. Torqued also has a free version.
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