Thanks for the info. Once I have the 4dKH solution, is the amount of pH indicator critical? My pH test kit calls for three drops of test solution for 5mL of water.
Also, I found a good source for small glass containers: empty salt & pepper shakers. They even have a nice look to them. The ones I found had an opening of .700", so with a little muscle and possibly some hot water to soften the tubing; a piece of 3/4" OD clear vinyl/acrylic/pvc tubing wedges into the opening quite nicely. Any grocery store or discount outlet should have a variety of sizes & shapes for a few bucks.