Inaccurate
I have been using this app since many years and I paid for it as well as a show of support to the developer. When I shifted from my iPhone XR to the promax I didn’t bother to recheck the app calibration. Yesterday when I was measuring something claimed to be 50mm, I go a reading of 44mm. When I physically used a scale is saw that the app was completely inaccurate. Both cm and inches and there is no way to calibrate it either!