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The manufacturer of Onset rain buckets, Texas Electronics, offers a calibration kit that makes it easy to calibrate your rain gauges in the field.
The attached PDF file shows how data from a smart rain gauge (S-RGA-M002 and S-RGB-M002) is depicted versus how it's depicted when recorded with an RG3 or RG3-M stand-alone data logging rain gauge.
Attached is a screenshot that shows the HOBOware error values displayed when a smart sensor is disconnected from a smart sensor-compatible logger, specifically the HOBO H21-002, U30, and H22-001.