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@Dammit
Measures the strain between the axle and the chainring, so it's taking the net force of both legs, rather than measuring the deflection in the left hand crank (or crank/axle) and doubling that figure.
You can see from the table I just posted that if you doubled my left leg power you'd under-read by 10%, conversely if you doubled the right leg it'd be 10% high.