noun
degausser; demagnetizer
A device that removes unwanted magnetism from objects, such as CRT monitors, magnetic tapes, or tools.
古いブラウン管テレビは、消磁装置で色むらを直すことがある。
Old CRT televisions sometimes have color unevenness corrected with a degausser.
磁気テープを廃棄する前に、消磁装置でデータを消去する。
Before disposing of magnetic tapes, data is erased with a degausser.
消磁 is the process of demagnetization; 消磁装置 is the device that performs it.
Compound of 消磁 (demagnetization) and 装置 (device). The exact historical derivation is uncertain, but the term is a straightforward technical compound.