Do not apply an offset to a SwitchBot Meter just because a second meter across the room reads differently. SwitchBot provides a calibration option for supported meters, but a useful comparison first separates placement differences from a repeatable difference under the same conditions.
Give both meters the same trial
Place the meters near each other away from direct sun, a vent or a heat-producing device. Let their readings settle and record both at the same times. If one used to sit on a cold windowsill and the difference shrinks after moving it, the first comparison was not a fair basis for calibration. Keep temperature and humidity readings separate in your log.
Only adjust against a reference you trust
If a stable difference remains, verify which device you trust as a reference and whether the meter model supports the relevant adjustment. Save the previous setting before changing one value in the app. Repeat the side-by-side check; if readings drift in different directions, do not force a single offset to fix every condition. This is a household comparison, not laboratory calibration or proof of sensor accuracy.
Source: manufacturer’s current documentation. Related: check which hub would make a meter readable remotely.
