The Keeler Practitioner is a popular otoscope that tends to be purchased by GPs or Primary Care Specialists. Supplied as an otoscope head and bulb only, a Dry Cell AA Battery Handle 2.8V is required for use. Unobstructed open style head Large removable 2.5x magnifying lens for easy introduction of small instruments for wax removal Facility for pneumatic testing for tympanic mobility 2.8V illumination Compatible with reusable or disposable specula Requires a 2.8V Dry Cell battery handle for use Note: The Practitioner 2.8V Otoscope Head and Bulb is compatible with a 2.8V Dry Cell Battery Handle only.