1. The compass features a triangle that indicates the magnetic north pole. 2. The small side window and the red reference line facilitate the reading of azimuth data. 3. Positioning posts are provided at the 0 - degree and 180 - degree positions of the scale ring. The direction can be set by rotating the scale ring. 4. The compass is designed with balance. In non - horizontal states, the compass will not tilt and rub against the window frame, thus preventing the compass from getting stuck. Its scientific design makes it suitable for use in both the northern and southern hemispheres. 5. The precision of the inner teeth of the scale ring makes the calibration ring more accurate and effective in reducing directional errors. It is waterproof up to 50 meters and suitable for deep - water operations. 6. The liquid - filled light - absorbing compass can absorb light sources such as sunlight and lamp light and emit night - glow in the dark, enabling accurate data acquisition. 7. It is equipped with a high - density, high - quality elastic cord that is tight, stretch - resistant, and adjustable. 8. Color: Black + Silver 9. Material: ABS + Glass 10. Dimensions: 8.2 x 6.2 x 3.5 cm 11. Package contents: - 1 diving compass - 1 elastic cord - 1 English instruction manual 12. Only the above - mentioned items are included in the package, and no other products are included. 13. Note: Light reflection and different monitors may cause slight differences between the color of the items in the picture and the actual product. A measurement error of +/- 1 - 3 cm is allowed.