The March 809 HS 3500RPM model can be upgraded with a larger impeller from the March 815 model.
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After reading this thread it got me thinking, scary i know, but i wonder how much more efficient using 2 immersion chillers in-line ould be? One inside the wort and another in a cooler full of ice water with the pump. A garden hose doesn't seem too efficient at heat transfer. anyone ever try it?
I recently purchased the same meter. The probe ideally should be stored in the "storage solution" at all times. I use distilled water. I am planning to store the probe in a small water bottle with a hole and slot cut into the cap to accomodate the wire.
Here's a video on calibration I got from the Milwaulee website..