| Model | GM-171 Binocular | GM-171 Trinocular |
| SKU | 1100200600842 | 1100200600852 |
| Optical system | Greenough | Greenough |
| Observation tube | Binocular head | Trinocular head |
| Inclination | 45º inclined | 45º inclined |
| Trinocular light split | - | 50:50 |
| Interpupillary distance | 52-75mm | 52-75mm | |
| Diopter adjustment | On both eyepieces, +/- 5 diopter | On both eyepieces, +/- 5 diopter | |
| Eyepieces | Widefield WF10X/23mm | Widefield WF10X/23mm | |
| Objectives system | Zoom, ratio 6.7:1 | Zoom, ratio 6.7:1 | |
| Objectives | 0.75X~5X | 0.75X~5X | |
| Working distance | 110mm | 110mm | |
| Stand type | 360º rotary base | 360º rotary base | |
| Diaphragm | Iris diaphragm, adjustable aperture Ø41mm - Ø2mm | Iris diaphragm, adjustable aperture Ø41mm - Ø2mm | |
| Head holder | For Ø76mm head | For Ø76mm head | |
| Focus mechanism | Coarse focusing system with tension adjustment | Coarse focusing system with tension adjustment | |
| Focusing stroke | 125mm | 125mm | |
| Incident illumination | Fluorescent 7W with Gooseneck adjustable | Fluorescent 7W with Gooseneck adjustable | |
| Transmitted illumination | Quartz Halogen 6V/30W with intensity control | Quartz Halogen 6V/30W with intensity control | |
| Illumination features | Darkfield illuminator | Darkfield illuminator | |
| Transformer | Internal | Internal | |
| Power supply | 100-240V (CE) | 100-240V (CE) | |
| Accessories included | Dust cover, stainless steel wire stone holder, aluminium carrying case | Dust cover, stainless steel wire stone holder, aluminium carrying case | |
| Dimensions LxWxH | 391x236x505mm | 391x236x505mm | |
| Base | 306x236mm | 306x236mm | |
| Column/Arm | Height 268mm, 45º tilting arm | Height 268mm, 45º tilting arm | |
| Net weight | 8.2kg | 8.2kg | |
| Standard contrast technique | Brightfield, darkfield | Brightfield, darkfield | |
| Polarization | Optional add-on | Optional add-on | |
| Darkfield | Condenser | Condenser | |
