What do customers say about the PoolWaterLAB ?

This product has received both positive and negative reviews. Almost all of the negative views stem from buyers who are getting wildly inaccurate readings. That was my experience when I first began using the PoolLab 1.0 water tester. It is important to follow the instructions in the correct order, which is not made entirely clear in the instructions.
1. Turn the unit on
2. Add water for testing
3. Only then press the ZERO button
4. Only then add the tablet
5. Be sure it is fully dissolved with the provided stirring stick. This could take up to 2 minutes
6. Cover the testing well
7. Only then press the appropriate testing button (e.g., fCl for Free Chlorine)
I was able to get accurate readings following these instructions.