A spirit level includes a spirit level body. At least one measurement surface is arranged along the spirit level body, and the spirit level body is formed by a hollow profile member—preferably of rectangular cross-section. The at least one measurement surface extends uninterruptedly along the hollow profile member. At at least one first or second side wall which is preferably formed at a right angle to the measurement surface is at least one opening for insertion of at least one magnet or magnetizable body into the cavity in the spirit level body.
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