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How long can a dwc last without power..? What about a charged air compressor as a backup?... oil free, so should be good air..?

I'm currently using a ph test solution, so going to a meter is a huge leap ahead... Bluelabs is twice as expensive so i just wanted to make sure I wasn't buying something disposable like 'Amazon pH pens' that are cheap and you get what you pay for... With the pH solution, it says 3-5 drops...

It seems many prefer BlueLabs products for high end measuring devices/ meters for ph, tds ec... Does anyone use currently or have used recently the Milwaukee PRO 3in1 combo meter. ..or know the quality of the meters / company in general?