Measurement scale is way off. – Fractional Caliper - inch ruler, measure tool, carpenter woodwork Review

On an iPhone 6+ the measurement says 2 inches but it is actually 2.75 inches. I can't find any calibration settings or a way to contact the developer to let them know this. It looks like a nice app but unusable because it is not accurate.
Review by dannyt2 on Fractional Caliper - inch ruler, measure tool, carpenter woodwork.