A flat-mouth test tube is a round-bottomed, flat-mouthed glass tube with its mouth subjected to fire polishing treatment. The flat-mouth design facilitates sterilization to eliminate bacteria at the tube's mouth. Common specifications of flat-mouth test tubes include 15mm × 150mm, 18mm × 180mm, 20mm × 200mm, and 30mm × 300mm.

The rolled-edge test tube is a round-bottomed glass tube with a rolled (or rounded) rim. The rolled (or rounded) rim is designed to enhance mechanical strength, facilitate gripping, and prevent it from easily slipping off.

The fermentation test tube is a flat-mouthed, round-bottomed test tube with a narrow and short neck (with a diameter of 6 millimeters and a length of 30 millimeters).

The side-arm test tube is a flat-mouthed test tube equipped with a lateral branch tube, which is primarily used for connecting to an air extraction tube. The tube mouth is inserted with a perforated rubber stopper into a filter funnel, serving as a substitute for a microfiltration bottle and functioning as the receiving vessel for microfiltration.

A graduated test tube, which has the appearance of a round-mouthed test tube, features capacity scale markings engraved on its body, allowing direct reading of measurement values and offering great convenience in use.

Stoppered test tubes are round-bottomed glass tubes with necks, equipped with ground glass stoppers above the necks. The stoppers can prevent volatile solutions from evaporating.

Graduated test tube with a stopper, it is a test tube equipped with a ground glass stopper and marked with capacity graduations on its body. For volatile substances, it allows direct measurement while preventing volatilization, making it very convenient to use.

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