How to ration salt in small quantities? I have high-ish blood pressure and the doctor said keep the salt under control.  It is easy to ration controlled amounts of salt when cooking large amounts of stews and similar foods and you add salt by teaspoon.  But I don't really make stews that much, most of my cooking are single or double servings that I just salt with a sprinkler.  I do have a nice salt sprinkler, about 8 oz, however, it is very difficult to gauge a proper amount of salt approximately so I often either over- or under-salt.  

Is there a device that will accurately measure portions of a teaspoon and at the same time allow me to sprinkle them evenly? Because, if I measure maybe a quarter of a teaspoon, sprinkling it between fingers doesn't distribute salt as evenly as using my sprinkler, which is, like I said above, prone to inaccuracy.  Is there any way (a device of some sort) to reap the best of both approaches?
You may need to practice sprinkling salt -- 


Get a large piece of paper or plastic, that's preferably not white.
Sprinkle some salt on it.  Try from different heights.  You might also try different types of salt (I find coarser salts easier to control)
Roll up the paper (or plastic), so you can pour the salt back into a small dish to try again.


Once you're comfortable with sprinkling salt :


Measure out the salt.
Pour the salt into your off hand.
Use your good hand to take pinches of the salt &amp; sprinkle it on the food.


If you're really wedded to a shaker -- you might consider a grinder and coarser salt.  If you know how many grinds it takes to get a teaspoon, you could roughly estimate how much salt is going in by counting grinds.