What is the accuracy of INPEAK POWERCRANK?

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• Is the crank drilled or milled during assembly? Does the installation of the device affect the strenght or mechanical properties of the crank?
• Will POWERCRANK work in a MTB bike?
• I have an oval chainring. Will POWERCRANK show correct values?
• I have a disbalance between the right and left leg. Will POWERCRANK work properly?
• Do I need to install the magnet or cadence sensor on my bike when using the POWERCRANK?
• Is the device resistant to the conditions during training / competition?