Features: - With light source and scale. - Adjustable focus makes a clear observation. - Accurate and precise. - High transparent optical lens doing no harm to eyes. Product info 1 (magnification 100, light + scale, white color) 2 (magnification 40, light + scale, white color) 3 (magnification 40, light, black color) 4 (magnification 25, scale, pen-like style) 5 (magnification 10, needle indicator, three-fold style) Operation: Please see the user’s manual for detailed operation guide.