^^^^ I second what untamed said.
One exception, you DO want to measure pH of a reactor's effluent, and forget trying to use test kits for that. You need to know the difference between 6.6 and 6.7 and 6.8 and you really need a meter for that sort of thing. 6 years ago I tried dialing in a reactor using pH test kits. That lasted about 3 weeks. Bought a meter and never looked back.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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