Maybe you’ve made your own cheese, or installed a solar panel, or you’re filtering seawater for your aquarium. Anytime you have some kind of physical process in place, you’d probably like to monitor it so you know what’s going on and you know when you’re having a problem. With your own monitoring system, you can measure temperature, current, salinity, or just about anything else you need to track with digital panel meters. But you need to know the reading displayed is accurate. That’s why you calibrate your meter.
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Originally published in eHow, OCT 2011