Been thinking on this… Lots of workable options presented. It’s just choosing the one that works for you.
For your own peace of mind, I say buy the meter. Keep it properly stored and calibrated, it will serve you well in the short term. With your trip coming in a few weeks, I think you’ll be much happier being able to test PH when you want without diluting or letting the FC drop.
Long term, if the meter becomes problematic, you’ll be able to use the comparator block again to test anytime. Or even to check the meter. Just have to wait til the CYA is down enough to let the FC stay below 10 and you already have a plan for that
