![]() Tool Markings on scuba tanks include: Date of hydrostatic test, serial number, type of material Atmospheric pressure at sea level is: 14.7 pounds per square inch/1.0 atmosphere absolute (1.01 bar) A sealed balloon filled with air that has a volume of 4 liters at 99 feet of seawater (30.2 m) will have a volume of _ liters at 33 feet of seawater (10.1 m). Lubber The dive knife is used primarily as a _ for digging, cutting, pounding, and prying. ![]() ![]() You should have your regulator serviced by a certified repair technician: At least once per year The stage of the regulator which reduces tank pressure is: first Two types of materials that scuba tanks are made from are steel and Aluminum The _ line is the direction of travel line on the compass.
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