"BNZ Convert It is a currency converter. It uses your camera to scan prices, converting them to New Zealand dollars instantly – and even works offline.
The app uses the latest mid-market rates that are accessible when your device is connected to the Internet. Those rates are then saved to your device until you’re next online. Those rates are not able to be transacted on by consumers. See our FAQs for more information.
When you’re outside of New Zealand and connected to the internet, Convert It can detect the local currency of the country you’re in so you can get an idea of what you might be spending before you make a purchase."
I have tested this app and it has problems with numbers which have commas in the string.