Measurement
ΔX：
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ΔY：
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Width：
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Height：
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Distance：
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Not calibrated: currently showing pixel values only. Switch to “Calibrate” to convert to centimetres/inches.
Tip: drag points A and B to measure; when both handles are hit, you can move the entire segment (easier when A and B overlap).
Calibration (optional)
Align the distance between A and B with a known physical length, then enter that length in millimetres and save.
Current distance
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Current ratio：
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Recommendation: use a bank card width (85.6mm) or a 10cm segment on a physical ruler, and switch to fullscreen for better accuracy.
