The test kit has 5 tests ammonia, nitrate, nitrite,ph and kh. Why put kh test into this kit and not phosphate when they have the kh, calcium and magnesium kit. If you stick with Red Sea test kits it forces you to buy an extra kit there by increasing your cost. Also the kit came with only 3 vials for 5 tests. When I want to test for all 5 I need to clean and dry 2 vials. Plus the syringe isn’t easy to read I have a syringe that cost $2.50 that is much easier to read and holds more water. This doesn’t sound important until you realize how important correct measurements are. Some of the test take more than one syringe full the more measurements the more chances of error. My last complaint has to do with the kh test the pipPete seems unable to consistently measure one drop. There are many positives with this kit and am overall pleased with this kit and am not trying to persuade anyone from buying this kit. Maybe hoping Red Sea will address some of these issues