Specification:
Guide (North) Need for use:
 flat guide (North) needle, as long as the turntable to stop turning, look at the dial on the line on the line. Chinese version of the things north and south refers to the direction of things is north and south. English version of the N is the north, S for the South, E for the East. W for the West.
Note:

1. When using the guide (North) needle, there must be no iron, magnet and other interference guide (North) needle used items; guide   (North) pin must be flat.
2. Guide (North) need not use the needle, should stay away from the magnet, iron and other magnetic objects stored in the dark.
3.The thermometer has 2-3 degrees above and below the error.