Re: So you want to add borates to your pool--Why and How
This is the one I have in my Skimmer. Its not waterproof so you can not leave it in the pool. I get roughly 7.5 on the test strip so its pretty accurate. I just calibrated it to make sure. Seems nothing in the pool throws off the reading either. I use ph controllers on my tanks that turn on/off co2 when its not needed.