I got the Red Sea Pro kit in last Friday and used it the first time yesterday. I am getting ready to dose Tech M for cyano... One tricky thing I noticed was that you pull the plunger back to set on the line of the measured chemicals and not the fluid level. So it appears that you don't have the correct amount of fluid but in doing so correctly they are taking the tip of the syringe in to account. I made this mistake of pulling the fluid in to the amount required rather than the edge of the plunger the first test I did and the numbers were whacky. The Alk test is tricky IMO though in when you have reached the proper end color. Reminds me of the API ph and ammonia test kits.