Two examples of a multiple water sample device with Niskin bottles. The device in the first figure is a design for shallow water and estuarine applications; it carries 12 Niskin bottles of relatively small volume. Two bottles are shown in the open position, when the water can flow through. The remaining bottles are shown in the closed position.

The second figure shows a system for deep ocean use with 24 Niskin bottles and thermometer holders for reversing thermometers. Some bottles on the left are open, with the thermometer holder in the upright position. All bottles at the front are closed, and their thermometer holders are in the reversed position.

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