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 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 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 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 . <EOS>