Stereomicroscopy is easy with our Philip Harris range of Stereo microscopes. The Philip Harris SFX-91 Stereo microscope is a simple instrument that will allow the student to be completely in control and have fun investigating the microscopic world. A highly reliable instrument with solid construction.The internal NiMH rechargeable battery gives up to 8 hours use from a single charge. The time required for a full recharge is approximately 8 hours. Transmitted and Incident LED illumination of medium intensity. The SFX-91 also has a handle for ease of transportation and a touch controlled adjustable incident and transmitted illumination. Stereo Microscopes are more suited to examining solid objects such as rock and fossil samples as opposed to prepared microscope slides.Accessories included:Power supplyInstruction manualDust coverAccessories available to purchase separately:Eyepiece WiFi Cameras (PP00050387 - USB PP00050388 - Wireless)Eyepiece Micrometer ST005 (B8R06423)Stage Micrometer (B8A76119)Alcohol-free Antiseptic Wipes - for cleaning eyepieces between use (B8R08715)Lens Cleaning Tissue (PP00052867)Microscope Maintenance Kit (B8R07243)Technical Specifications:Total magnification: 10 x 20x 40x selectableEyepieces: Wide Field 10x/20mmHead: Binocular 45° inclined. Diopter adjustment on both eyepiece tubes. Interpupillary distance adjustable between 53 and 75 mmStand: Fixed with focus mechanism with handleObjectives: 1x 2x 4x selectable. Working distance 60mmStage: Black/white disc for contrast and semi-transparent plastic disc for transmitted light with specimen clampsFocussing: Rack and pinion mechanism controlled by a pair of knobs placed on both sides of the microscopeIllumination: Double adjustable illuminator for incident and transmitted light fitted with two high-efficiency 1 W LED light sources with internal rechargeable battery. Touch brightness controlVoltage: External power supply 110/240 V 50/60 Hz. Max. power 3WDimensions: (H)288mm x (W)183mm x (D)205mmWeight: 2.0 kgAge Suitability: 11 - 16 Years (also suitable for use in primary schools)