I have the API test kit with PH testing and High Range PH testing. With regular PH testing my levels are off the chart (literally) when comparing to the little chart that came with the test kit. I'm guessing around 8 to 8.5, appx. BUT when testing for High Range PH it tests right st 7.4 (which is lowest on the scale for the chart to follow by). I used Tetra EasyBalance yesterday, left it alone and this morning is when I tested and got these results. Any insight?