O.K.
Very difficult to match the colors, the colored patches bleed into each other right away, and therefore distorting the results. The plastic box is very difficult to open, you have to apply a lot of force to open it, and when it finally does open the strips spill out flying everywhere. It's a nightmare to put them back in that narrow box. I don't think I'll buy it again. I rather spend little more money and get something more user-friendly and more accurate.
Rating: 3 stars