The 3 Step Drum Magnification (3S) and 5 Step Drum Magnification (5S) microscopes are advanced, mobile surgical microscopes designed to offer high-quality optical performance for a range of medical applications. Both models feature a sturdy, portable, and balanced stand, with mobility provided by four castor wheels for ease of movement. They share several features, including:

- Height Adjustment: Both models have an adjustable height, with a maximum of 1870 mm and a minimum of 1350 mm, to accommodate various user preferences and ensure optimal viewing.
- Penta Arm Rotation: Offering a rotation range of 0° to 300°, the penta arm allows precise positioning of the microscope for varied procedures.
- Eyepieces: Both models come equipped with WF 12.5X/16mm eyepieces, featuring diopter adjustment (+/- 6mm) and diopter lock. The 3S also offers an optional WF 10X/16mm eyepiece, providing flexibility for different viewing needs.
- Interpupillary Distance: Adjustable from 50-75mm, ensuring comfort for various users.
- Objective Lenses: The 3S includes an apochromatic lens with a focal length of 200 mm (optionally 175mm), while the 5S features a variable apochromatic lens ranging from 200mm to 400mm, providing greater versatility.
- Magnification: The 3S provides three magnification steps (6X, 10X, 16X), while the 5S offers five steps (4X, 6X, 10X, 16X, 25X), allowing for more detailed observation across a broader magnification range.
- Fine Focus: Both models feature a motorized fine focus range of 45mm (3S) and 40mm (5S), using a rack and pinion mechanism for smooth adjustments.
- Illumination: Both microscopes offer 80,000 lux at the 250mm objective, with built-in heat-absorbing filters and optional blue and green filters. This ensures clear, bright, and high-contrast illumination for precision work.
- Built-in Filters: The microscopes come with various filters, including heat-absorbing, blue (red-free), green (red-free), UV, and an optional black dot retinal protection filter.
- Optional Accessories: These include a 0-180° tiltable ergonomic head, straight binocular head, double beam splitter, assistant binocular attachment, and camera adapters. The 5S includes the Mi-Cam 5MP integrated digital camera module for enhanced image capture.
- Weight: Both models weigh approximately 100 kg, offering robust stability during use.
- Packing: They come in EPF packing with cardboard for secure transport and storage.

These microscopes are designed for professionals requiring precision and reliability in fields such as surgery, diagnostics, and medical research, combining superior optics with user-friendly features and advanced mobility for seamless operation.