If you’re someone using these one step tests you have to be very careful! I took a test with this brand (strip test) and got a light positive so I tested in the next couple of days hoping to see a darker line but instead I got a negative test. I was absolutely devastated. However it turned out that when I did the second test, I touched the area where the ink comes out from (not the blue side, it’s marked on the photo) and a bit of liquid came out onto the middle of the strip, this caused the test to become faulty and not show anything. I was determined to test again so i did the next day and this time was very careful not to touch anything. Lo and behold there was the line from the first test I did! So be very careful when you handle these tests so you don’t get an inaccurate result!