I have an iPhone 11 Pro Max is there any app or internet software that will turn my phone into a digital scale? that can weigh out grams?

I have an iPhone 11 Pro Max is there any app or internet software that will turn my phone into a digital scale that can weigh out grams ounces pounds . All the ones I seen are not available… I don’t have the 3D Touch, but the Haptic Touch. It is possible or not?

I also have a IPad 9th generation. Is it possible to use it as a digital scale itself?

Thanks for your help!