Generally, it is not recommended for regular depth gauges with flat probes, as the flat probe cannot fully contact the curved bottom, resulting in large measurement errors. If measuring curved or irregular bottom surfaces is necessary, use a depth gauge with a spherical or pointed probe (specialized for irregular surfaces). Additionally, ensure the base is still firmly attached to the flat reference surface of the workpiece to avoid affecting the measurement baseline. For highly irregular surfaces, consider using a coordinate measuring machine (CMM) for more accurate results.
