Perhaps you should consider using a food tracking app on a phone or computer. I have used Chronometer (the free version) on my PC. Chronometer has a large database of food products that can be accessed by typing the name in the search bar. For example, you could type Little Salad Bar Spring Mix and it will give you all the nutrients (protein included) in a serving. The app has a diary, enter (search) for all the items you eat, add them to the daily diary, including water you drink and it will give you a pretty precise overview of your intake for the day. Most meals at chain restaurants are also in the database, it helps you avoid the high sodium foods, or cut back on portions to keep your levels where you want them. Another feature, you can create your own recipe entries from individual ingredients also in the database. This might help you manage protein intake and other levels.