Thinking about switching to a digital titration kit, anyone done both

Started by Alan Pierce · · 2 replies
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#1
I've been doing drop count titration with the TF-100 for years and my eyes aren't getting any younger reading that pink endpoint in the FAS-DPD test, especially at dusk after work. Saw there are digital titrators now that give you a number instead of me squinting and second guessing whether that was drop 11 or 12 that turned it.

My worry is accuracy versus just convenience. Drop count math is simple multiplication once you know your kit's drop value, and I trust it because I understand exactly what it's doing chemically. A black box that spits out a number makes me a little nervous if I can't see the reaction happen.

Anyone actually run both side by side on the same sample. Curious if the digital ones agree with manual titration or if there's drift, and whether it's worth the cost for someone who already tests every couple days without complaint. Not trying to fix something that isn't broken here.

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#2
Haven't run a digital titrator against my K-2006 so I can't speak to drift, but the dusk squinting thing resonates, that's exactly when my FC reads "4.5ish" instead of a clean number in my log.
#3
Same dusk squint thing happened to me before I just started testing earlier in the evening instead of fighting the light, pool's small enough that a five minute shift in timing isn't a big deal when you're only dealing with a spool's worth of water. Never tried the digital titrator so can't tell you if it drifts against drop count, but honestly with volume this small my FAS-DPD drops are so few per test that any rounding error on my end is tiny anyway, bigger pools probably feel that squint math more than I do.