【Parameter】: Magnification: 5X; Range of slit length: 5mm-11mm; Minimum slit width: 0.2mm.Working distance: 12-32mm. 【Handheld slit lamp microscope】: A thin slice of light beam is projected through a slit into the subject's eye to form an optical fault, and the diagnosis is accomplished by observing the reflected light from the fault. 【Adjustable Slit 】: Pull the Lamp Head back and forth to adjust the width and the length of the slit,as well as the intensity of th light. 【Portable Slit Lamp】: A pocket-packed inspection device, Professional and practical design with beautiful appearance, easy to carry and use. 【Applicable】: Usually used in Pet Hospitals ,Ophthalmologic, laboratories, schools, sample observation, eyepiece protection, etc.