Halogen Otoscope 2.5v Halogen Otoscope with Plastic Head and Handle. Movable Optical glass viewing window with 3x magnification. Plastic reusable speculum size 2, 3, 4, 5, 6mm. AA size Battery Handle. Available in hard case plastic case. Specification Otoscope Head 2.5v Otoscope Head with Thread Contact fitting supplied with 5 reusable aural specula in sterilizable black nylon.