Ask HN: Simple data collection apps with QR/Barcodes?

Hi, I'm looking for a relatively simple iOS app that probably already exists - however after trying dozens of apps from iTunes I've yet to find it.

Basically I have a collection of plants that I would like to collect data on throughout their life cycle. Each one is labelled with a QR code that I've generated.

I want to scan a QR code, have the plant come up, and be able to enter measurements into custom fields. For example, I would like to create a custom field called "Plant Height June 18", so that I can scan each plant, measure it, and enter the value. Ideally the output will be a csv or similar table, with plants as rows and my custom fields (measurements) as columns.

It's much simpler than the hundreds of inventory apps available already, however I have no need for quantities or pricing, just simple data entry with the ability to create custom fields. The closest I've been able to find is an iOS app called Inventory Scanner 2015, however it only allows up to 3 custom fields. Other promising apps like Sortly can only use QR codes generated by their app, which is an issue.

Hopefully I've been clear on what I'm looking for. If anyone knows of any apps that fit this description, I would love to hear about them. Perhaps I'm missing the magic combination of keywords to find it!

Cheers