Test Tube Holder, Metal Wire

Quick Answer: The Test Tube Holder, Metal Wire is a wire test tube holder bent from one length of spring wire, as the listing photograph shows: loops at one end form the handle and the other end forms curved jaws that close on a test tube. Squeezing the handle end opens the jaws; releasing it grips the tube.

One Wire, Spring and Jaw

The design is as simple as laboratory hardware gets. The springiness of the wire itself provides the clamping force, so there is no separate spring, screw or rivet to fail. Squeezing the two sides together at the handle end spreads the jaws; letting go closes them onto the tube. The small loop bent into the wire, visible in the photograph, acts as hinge and spring together.

A holder of this kind is light and slim, which makes it easy to use over a spirit lamp in a crowded class and to store in large numbers. Being all metal, it tolerates brief contact with a flame without charring, unlike a wooden holder, although the wire near the jaws heats up quickly and should not be touched.

The thin wire grips the tube along narrow lines, so it holds less steadily than the metal strip holder, and tubes can rotate if the spring has weakened. For large-diameter boiling tubes, check that the jaws open wide enough; glass test tubes sold in packs are the usual partner.

Applications

• Heating small volumes of liquid in test tubes over a spirit lamp or Bunsen burner
• Holding a tube while gases at its mouth are tested with a lighted or glowing splint
• Lifting tubes out of a hot water bath
• Primary and middle-school practicals where many holders are handed out at once

Specifications

Care & Handling

• Do not bend the wire test tube holder open further than needed; overstretching weakens the spring.
• Let the jaws cool before putting the holder down on plastic trays or paper.
• Discard holders whose jaws no longer meet squarely; a twisted jaw drops tubes.

Why Choose LabEquip

Schools running practicals for large classes rely on wire holders because they are simple and hard-wearing. LabEquip supplies them in quantity from General Lab Products.

Frequently Asked Questions

How do I open a wire test tube holder?

Squeeze the two sides of the wire together at the handle end. The jaws spread apart; place the tube between them and release to grip it.

Is a wire holder safe to use in a flame?

The wire does not char or burn, so brief contact with the flame is not a problem, but the wire near the jaws gets hot quickly. Hold only the handle end and let it cool before touching the jaws.

Why does the tube rotate in the holder?

The wire grips along narrow lines, and the spring weakens with use. If tubes turn or slip, replace the holder, or use a strip-jaw holder for a firmer grip.

What size tubes does it hold?

Wire holders of this pattern suit standard test tubes. Check that larger boiling tubes fit between the jaws before using them in a practical.

How is a wire holder different from a wooden one?

The wire holder is all metal, slimmer and does not char. The wooden holder keeps the hand cooler and is gentler on the glass, but it can scorch if held near the flame.

What is the safe way to heat a test tube?

Hold it near the mouth at an angle, point it away from people, and move it gently in the flame so the contents heat evenly. Never look down the tube while it is being heated.

Last Updated: September 2026