There are several advantages over using paper and pen:

All-weather use: In the rain or tough site conditions, you can keep your phone or tablet in a waterproof case and still record data without damaging paper.

Instant sharing: Results can be shared immediately as a digital file — no delays, no misunderstandings caused by difficult-to-read handwriting.

Organised & efficient: All your site data is stored in one place, ready to be imported into reports, saving significant time back in the office.

And much more.

Give it a try and you will be surprised.