I’m a residential tech and I’ve been using a Fieldpiece SDMN6 to show homeowners their total static during tune-ups — seeing 0.85" WC on a 3-ton today opened a helpful duct conversation, but it’s a bit bulky in tight closets. Anyone running a smaller, fast-responding gauge that’s easy to explain at the kitchen table, or are smart probes treating you better for quick comfort checks?
I ditched the bulky SDMN6 for a Testo 510i — tiny in tight closets and quick, and homeowners get it when I show the readout at the kitchen table. Your “0.85" WC” on a 3‑ton is exactly the kind of number that lands; just zero it away from the blower and keep the hoses short or it gets jumpy, . If you want a simple explainer to pair with it, this NCI piece helps: https://www.nationalcomfortinstitute.com/articles/total-external-static-pressure/.