Technical Parameters:
| Model | BM-20A | 
| Optical System | Infinite optical system | 
| View Head | Compensation Free Trinocular Head, Inclined at 30°, 360° rotatable, interpupillary 55~75mm | 
| Eyepiece | P10X/22mm, P16X/15mm | 
| Infinite Plan Achromatic Objective | 4X N.A=0.10 WD=20.00mm | 
| 10X N.A=0.25 WD=13.50mm | |
| 40X N.A=0.65 WD=0.68mm | |
| 100X(Oil) N.A=1.25 WD=0.20mm | |
| Focusing | Coaxial Coarse & Fine Adjustable System, Range 30mm, Fine Division 0.002mm | 
| Stage | Double Layers Mechanical Stage 155*145mm, Moving Range 80*50mm | 
| Condenser | Abbe NA1.25 centerable condenser with Iris Diaphragm & Filter | 
| Illumination | Halogen lamp 6V/20W, Kohler illumination, brightness adjustable | 
| Filter | Blue, yellow, green | 
| Power Supply | AC85~265V, 50/60Hz | 
| Package Size | 335*260*560mm | 
| Gross Weight | 10kg |