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The Tengfei 3.3GFC-165A is a specialized variant of the GFC-165 series azimuth circle. While it shares the core sighting technology of the standard GFC-165, the “A” suffix denotes a larger fitting diameter designed for compatibility with projection-type magnetic compasses (like the CGT-165).
Unlike the standard 165mm model, which fits a 165mm bowl, the GFC-165A actually uses the larger frame size typically found on 190mm compasses to accommodate the specific mounting flange of projection units.
| Feature | 3.3GFC-165A (Projection Type) | GFC-165 (Standard Type) |
| Inner Diameter | 247 mm | 226 mm |
| Outer Diameter | 260 mm | 239 mm |
| Net Weight | 1.7 kg | 1.5 kg |
| Primary Compatibility | CGT-165 (Projection Compasses) | CPT-165 (Standard Steering) |
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