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Scale Control Automatic Decompression Computer
This is a mechanical diving computer. The following is taken directly from the first two pages of the instruction booklet:
1) The DCR has a memory extended to 24 hours following the first dive,
thus it gives exact results in case of repeated dives.
The DCR dives indications for all dives requiring a first stop within maximum of 21 mt (70 ft) and that is even in case of very deep dives. In any case when the indicator reaches 21 mt (70 ft) the ascent should be commenced at once.
The DCR is for personal use like all decompression metres having built-in memory; thus it cannot be used by another diver until 6 hours have elapsed since the previous dive.
The DCR has the same type of measuring instrument of the DCS decompression metre which is known for its robustness and reliability.
The DCR is flat and rectangular with round edges, size 14.7 x 7.5 x 2.8. It has an anodized aluminium casing. Its air weight is 225 gr (0,5 oz)."