A hypodermic needle is a hollow needle commonly used with a syringe to inject substances into the body. This may also be used to take liquid samples from the body, for example taking blood from a vein in venipuncture. It is normally made from a stainless steel tube drawn through progressively smaller dies to make the needle. The end is beveled to create a sharp pointed tip. This lets the needle easily penetrate the skin.

Hypodermic syringe is a syringe with a calibrated barrel, plunger, and tip. It used with a hypodermic needle for hypodermic injections and for aspiration. When the plunger handle is pulled back, fluids are drawn into the tube. The fluid is forced out through the needle when the handle is pushed down. There are many hypodermic syringe designs available. However, all of them have the same general features, including a barrel, plunger, needle, and cap. The barrel is the part of the hypodermic needle that contains the material that is injected or withdrawn. A movable plunger is contained within this tube. The width of the barrel is variable.

Hypodermic syringes are used with hypodermic needles to inject liquid or gases into body tissues, or to remove from the body. Injecting of air into a blood vessel is undesirable, as it may cause an air embolism; preventing embolisms by removing air from the syringe is the reason for the familiar image of holding a hypodermic syringe upside down, tapping it, and expelling a small amount of liquid before an injection into the bloodstream. These type of syringes are reusable.

Hypotonic saline solution consists of water and sodium chloride in an amount no more than 0.9 percent of the weight of the water.

Hypoxia incubator chamber utilizes a surface-type seal where all portions of the O-ring are uniformly compressed by a stainless steel ring clamp for a reliable air-tight seal. The cylindrical walls and semi-spherical top and bottom provide minimum gas flow resistance and no inherent dead space during initial purging. The chambers have an integrated stacking feature for storage during or after experimentation. All units are molded from high quality polycarbonate.