A boroscope comprising a working head, the working head having a first end and a second end, a first optical fibre extending through the boroscope to a position between the first end and the second end of the working head, the end of the first optical fibre is arranged to receive light travelling with a component of direction transverse to the axis of the boroscope, a laser optical fibre extending through the boroscope, a mirror adjustably mounted on the working head, the laser optical fibre being arranged to direct laser light transmitted through the laser optical fibre onto the mirror on the working head, a first light source arranged at a position between the first end and the second end of the working head, the first light source is arranged to direct light with a component of direction transverse to the axis of the boroscope, and an actuator device (90, 92) to adjust the position of the mirror, characterised in that: a second optical fibre extending through the boroscope to the second end of the working head, the end of the second optical fibre is arranged to receive light travelling with a component of direction parallel to the axis of the boroscope, a second light source arranged at the second end of the working head, the second light source is arranged to direct light with a component of direction parallel to the axis of the boroscope, the mirror is adjustably mounted on the second end of the working head by a gimballed mounting and the actuator device (90, 92) comprises a galvanometer mechanism or the mirror is adjustably mounted on the second end of the working head by a micro-electro-mechanical system and the actuator device comprises the micro-electro-mechanical system; the working head comprising a first cylindrical portion at the first end of the working head, a second part cylindrical portion at the second end of the working head and a third portion interconnecting the first cylindrical portion and the second part cylindrical portion; and the first light source, the end of the first optical fibre, and the at least one lens being arranged in the first cylindrical portion, the second light source, the end of the second optical fibre, and the mirror are arranged on the second part cylindrical portion. a second optical fibre extending through the boroscope to the second end of the working head, the end of the second optical fibre is arranged to receive light travelling with a component of direction parallel to the axis of the boroscope, a second light source arranged at the second end of the working head, the second light source is arranged to direct light with a component of direction parallel to the axis of the boroscope, the mirror is adjustably mounted on the second end of the working head by a gimballed mounting and the actuator device (90, 92) comprises a galvanometer mechanism or the mirror is adjustably mounted on the second end of the working head by a micro-electro-mechanical system and the actuator device comprises the micro-electro-mechanical system; the working head comprising a first cylindrical portion at the first end of the working head, a second part cylindrical portion at the second end of the working head and a third portion interconnecting the first cylindrical portion and the second part cylindrical portion; and the first light source, the end of the first optical fibre, and the at least one lens being arranged in the first cylindrical portion, the second light source, the end of the second optical fibre, and the mirror are arranged on the second part cylindrical portion.