Hi all, I am trying to get myself some PH Test Strips. There are broad value strips and narrower ones. either 1-14 or 2-5 for example. Should I get various in different ranges for .5/.25 accuracy or are the 1-14 just enough? Also I am interested in testing the following formulas. What ranges would I need? 4-6 + 8-14? Can I be sure that the solutions work just by their PH? Can I be sure the solutions DO NOT work just by their PH? -Dektol -Maco ECOFUX(Neutral ph?) -Adox Fix Adofix Color: -Tetenal BLIX -Tetenal CD -RA-4 CD/BLIX Thanks for any INFO!