Abstract: Sampler (1) for liquid substances, especially a water sampler, comprising a body (2), a sampling container (3) fitted with a sealable bottom (6) and cover (7), as well as a closure for closing the sampling container (3) of sampler (1) to be immersed in liquid upon a lowering cable (8), the closing being effected at a desired depth by a weight (13) to be dropped along the cable. The sampling container (3) is mounted for axial movement on body (2) external of the container. Body (2) is provided with a release mechanism (4) from which container (3) can be suspended in an upper position relative to body (2) upon a laterally hinged cover (7) which is in an open position. Hook (10) and peg (11) are provided for locking the laterally hinged bottom (6) of the upper positioned container (3) in an open position.