Magnetic Pole Identifier, Dailymag (CAT#: STEM-GLE-0244-WXH)

Magnetic Pole Identifier is a great tool for identifying the poles of magnets. A small magnet is painted on both ends and is suspended, free to rotate, in a plastic housing. The blue end of the magnet is the North pole and will point toward the South pole of other magnets. The red end is the South pole and will point toward the North end of another magnet.

The magnetic pole detector is a purely mechanical structure, the magnet probe is permanent magnet, the operation is sensitive, it does not need electricity, and it does not need batteries.
And the cost is much lower than electrinic model magnetic pole detector, The price is only one-tenth of the electronic version.

1 pair of X Power Magnetic Fuel Saver, Dailymag (CAT#: STEM-GLE-0116-WXH)
Sintered Hard Ferrite Magnet, HF8/22, Dailymag (CAT#: STEM-GLE-0053-WXH)
Sintered Neodymium Magnet (NdFeB magnet), N35, Dailymag (CAT#: STEM-GLE-0001-WXH)