The compass has a triangle indicating to point to the north of the magnetic field. The side small window and red reference line are easy to read the azimuth data. Scale rings 0 and 180 The position is respectively provided with positioning column, and the direction can be set by rotating the scale ring. The compass is designed in a balanced way, and the compass will not tilt and rub with the window frame under the condition of not horizontal, which will cause the compass to jam. Scientific design, applicable to both northern and southern hemispheres. The precision of the internal teeth of the scale ring makes the calibration ring more accurate and effective in reducing the direction error. 50m waterproof, suitable for deep water operation. Liquid filled light absorption compass can light sources such as sunlight and light, and emit night light in dark conditions to obtain data accurately. It is equipped with high-density high-quality elastic rope strap, which is tight and resistant to pull, and can be adjusted. Colour:black+silver Material:ABS+glass Size: 8.2 x 6.2 x 3.5CM Package Contents: 1 X Diving Compass 1 X Elastic Rope 1 X English manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.