An otoscope, comprising: (a) a flexible speculum, operable to be inserted into an ear canal； (b) a stopper, coupled to the flexible speculum, operable to limit penetration depth of the flexible speculum into the ear canal； and (c) an imaging sensor, located inside the flexible speculum, operable to capture an image of an eardrum of the ear canal； wherein a flexibility of the flexible speculum allows alignment of the imaging sensor according to a shape of the ear canal.
