0= '='? Or is it '=' =0?
Sadly, I'm going to delete this immediately - but hope for a vital update very soon.

An elegant and user-friendly scientific calculator that displays previous calculations in real-time as you type. It offers a clean interface for all your mathematical needs.
2.0
May 9, 2016
This app has been updated by Apple to display the Apple Watch app icon. Improved UI and functionality. Also added answer button which stores the previously calculated value.
MoreScientific Calculator Pro is an elegant and easy-to-use scientific calculator that displays your previous calculations as you type. It is designed for iPhone and iPad.
Scientific Calculator Pro is free for the first month. After the initial free period, pricing details would typically be available on the app store page.
Scientific Calculator Pro is available for iPhone, iPad, and iPod touch, indicated by its support for these devices.
Scientific Calculator Pro has an age rating of 4+, making it suitable for a wide range of users.
Scientific Calculator Pro was last updated on May 9, 2016, to version 2.0. Further updates would depend on the developer's release schedule.
Scientific Calculator Pro does not contain advertisements, as indicated by the absence of an 'hasAds' flag.
Key features include an elegant and easy-to-use interface, and the ability to display previous calculations in real-time as you are typing.
Based on the available data, Scientific Calculator Pro has a perfect 5.0-star rating from one review, suggesting very positive initial user sentiment.