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Note: 1. Place or hold the compass and use it horizontally to make sure the readings are correct (please place it on a magnetic table, etc.) 2. In order to avoid the disorder of the pointer, use light away from the magnetic, current objects, and some metal products (such as high- voltage lines. Mobile phones, audio, screwdrivers, magnets, etc.) 3. Do not beat or beat the compass with your hands so as not to affect the measurement accuracy 4. Do not leave the compass for long periods under the sun 5. Do not want to dirty cloth, alcohol to wipe 6. When not in use, place the compass in a clean, cool place away from magnetic material and avoid magnetic pointer consumption.