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A bottom timer makes a great backup to a dive computer. They record depth and time but do no decompression calculations.

Scubapro and Liquivision make dedicated bottom timers or selected Suunto models have a bottom timer mode that doesn't perform any decompression calculations.

Deep Sea Supply Uwatec Digital Bottom Timer Mount - Mike's Dive Store

Deep Sea Supply Uwatec Digital Bottom Timer Mount £12.00 GBP
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Liquivision Xen Bottom Timer - Mike's Dive Store - 1

Liquivision Xen Bottom Timer £310.00 GBP £332.00 GBP
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Scubapro Digital 330 Bottom Timer and Depth Gauge - Mike's Dive Store

Scubapro Digital 330 Bottom Timer and Depth Gauge from £110.00 GBP £139.00 GBP
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