In the strict compliance with the guidelines of the KHD manual, I made the first test and the test result was: 7.5°dKH. It's exactly the same as the result I used to test with Salifert! KHD is great! However, the result of my regular test the next morning was 8.3°dKH. After thinking, I found that the only difference is that the timing test no longer takes the following steps: 1. Vent internal reagent tube ...; 2. Flush measurement cell .... So, after I completed the above steps, the measured result was: 7.6°dKH; then, I tested it again and the result was still: 8.3°dKH. I don't know why this is, but the conclusion is: I want to get the same result as Salifert. I must perform the initial cleaning process before each manual test: 1. Vent internal reagent tube ...; 2. Flush measurement cell .... So I can get the result I want. I would like to ask GHL's servic to consider: Is there any possibility of automatic timing test improvement?