Should I get the Phosphurous Checker?

[Wheelman76]

I use the ULR phosphorous checker , works great and I can do two tests back to back and get very consistent results. Usually within 2 or 3 ppb. I think getting all of the powder out each time makes a big difference. I cut the edges of the packet off on two sides and then fold the packet into a V shape and pour. Seems to work well to get all of the powder out everytime.