Transforming values

Widgets can transform a value before showing it:

• scale — multiply/divide by a factor (e.g. raw counts → engineering units).
• offset — add/subtract a constant (e.g. sensor zero-point correction).
• unit_convert — convert units (e.g. °C ↔ °F).
• smooth — apply a moving average to reduce jitter.
• filter — only pass values meeting a condition.

Transforms apply on top of any aggregation. For permanent corrections that every widget and rule should see, set scaling on the tag instead (see device parameters).