Wouldn't recommend this product By Carlos on 12/17/2015Carlos wouldn't recommend this product to a friendColor transition is too faint to accurately measure K level. You can't measure anything over 400ppm. Very disappointed with the product. Do not waste your money
One of the lone KZ products that I did not like By Subodh on 11/28/2013Subodh wouldn't recommend this product to a friendanything between 350 or 400 looks the same. At 400, algae goes crazy. At 350, you're already way too low. Buy yourself a Salifert K test kit and save the trouble.