|   |  Standard Specification | BM166B | BM166T | 
		
			| Viewing Head | Compensation Binocular head inclined at30°, Interpupillary Distance 48-75mm | ● |   | 
		
			| Compensation Trinocular head inclined at30°, Interpupillary Distance 48-75mm |   | ● | 
		
			| Eyepiece | Wide Field WF10X/22 eyepiece | ● | ● | 
		
			| WF16X,WF20X eyepiece | ○ | ○ | 
		
			| Nosepiece | Backward Quadruple Nosepiece | ● | ● | 
		
			| Objectives | Infinite Semi-Plan Achromatic Objective 4X 10X 40X(S), 100X(S.oil) | ● | ● | 
		
			| Infinite Semi-Plan Achromatic Objective 20X,60X | ○ | ○ | 
		
			| Infinite Plan Achromatic Objective 4X 10X 20X  40X(S), 60X 100X(S.oil) | ○ | ○ | 
		
			| Stage | Double Layers Mechanical Stage:180X150, Moving range:75X50mm | ● | ● | 
		
			| Condenser | Sliding –in Abbe Condenser N.A.=1.25 With Iris Diaphragm and Filtersdiaphragm scale markings corresponded with the objectives of different powers. | ● | ● | 
		
			| Focusing System | Coaxial Coarse&Fine Adjustment, Fine Division 0.002mm, Moving range:20mm | ● | ● | 
		
			| Collector | High Brightness Collector | ● | ● | 
		
			| Kohler Illumination with Iris Diaphragm | ● | ● | 
		
			| Illumination | AC220V/110V, Super Light 3W LED illumination, Brightness Adjustable. | ● | ● | 
		
			| AC220V/110V, 12V30W, Halogen Lamp, Brightness Adjustable. | ○ | ○ | 
		
			| Filters | Green and Blue Filters | ● | ● | 
		
			| Optional Accessories | Turret Phase contrast Kit | ○ | ○ | 
		
			| Video Adapter With C mount | ○ | ○ | 
		
			| High resolution COMS Digital Camera 1.3MP, 2.0MP, 3.0MP, 5.0MP, 9.0MP with software | ○ | ○ |