I have an electronic tester, one from the TF website and another that tells me water temp and pH. I love mine. Does it require calibration? Yes, which I do monthly but the convenience of knowing the pH in seconds is nice as I like to test probably every 1-2 days. The time I save not doing drops, is spent in calibrating which only takes about 2 minutes once a month and usually I don’t need to adjust much, if at all. I find it handy but then it’s all in how much you test and convenience to you, ymmv.
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17.7k gal, 98 ft perimeter, IG quartz, 3HP EcoStar VSP, 1.5HP TriStar Dual Speed, 725 sq ft SwimClear Cartridge, Rainbow chlorinator, Paramount clear O3, Pro Logic controller, 500k BTU heater, AquaVac 500, Spillover Spa, 3 sheer waterfalls, 3 bubblers.