25x100mm Test Tube w/ O-Ring Adapter

SKU: 55908R

Starting from $1.10USD Each

Save More When You Buy More!
EACH $1.10 $1.10 /Unit
Box of 100 $55.00 $0.55 /Unit
Case of 600 $297.00 $0.50 /Unit

These 25x100mm (1x4") glass test tubes, have a nominal outside diameter of 25mm. If you have a hole that is slightly wider than the OD of the tube, an o-ring or elastic band, etc. placed under the rim may fix the problem. You can also see how the o-rings were used to position the test tube in this wall mounted spice rack. Rubber o-rings are generally available in hardware or plumbing supply stores.

Save even more with tube & stopper combos. No one beats our quality & price even with "free" shipping.

Looking for ideas on how to use test tubes? Check out these blogs: What is a Test Tube Used For? Not Just Labs! or Corked Glass Test Tubes for Chemistry Kitchenware. Or, some examples such as a cluster of short test tube flower vases & gourmet food sampler


Here are excerpts from what two customers had to say about our 25x100mm test tubes. Click on their names to see the full review in Google.

Deshana Barua: I brought some glass tubes to display my propagations and replace a broken one. Their prices are very reasonable (it’s impossible to buy just a single piece from online retailers like Amazon, which I’d rather not support anyway)...more

Cathy Waitinas BEST quality, best prices, best customer service for consistent high-quality lab glass and powerful magnets for any projects. Lab, classroom, workshop or crafting projects. Orders of all sizes — just a few or boxes of 50 to 100, their …more

Related information or images
In Kits
  • Borosilicate glass: heat-resistant/autoclavable, food & dishwasher safe.
  • 25x100mm tubes have reinforced rims for stoppers
  • 25x100mm tubes have rounded bottoms & require support to stand upright
  • Completely unmarked for decorative use
  • 25mm (~1"); 100mm (~4")
  • Tube capacity/volume is ~30mL/1.1 fl. oz

  • Note: Test tube diameter and length is nominal; there can be a variance of as much as +/- 0.5mm. We cannot guarantee they will fit test tube racks or stoppers we don't supply.
Reviews (16)

Very good service and product, a very rare thing these dighly recommended.

— Claude
— Indigo:

Thanks for the "high 5".


Excellent quality glass tubes. I am using them in wrought metal flower holders. They were a little bigger than what I was replacing but that was a measuring error on my part. Even so, they fit and look nice. Well packaged, safely and promptly delivered.

— Peter

I received my products in good condition and well packaged. My order came sooner than I expected. Thank you.

— Sherry

As advertised. Shipped promptly. Will use again!

— David

The tubes shipped very quickly! A great deal and great quality.

— TM

the test tubes were exactly as I needed for a craft project, they came protected and on time

— Theresa

Great quality, fast shipping! Used these as a bridal shower favour with loose leaf tea. Purchased the corks to go with.

— SJ
— Indigo:

Tubes are used more and more for wedding related applications. Happy we could contribute to your special day.


Perfect for my projects.

— Ted

Stoppers and tubes work great and are in good condition.

— David

These where exactly what I was looking for. I will be back 4 more!

— B

Exactly what I was looking for. Very, very, pleased. Highly recommend this product!!!

— Strohvio XO
Really easy, reliable order process. Will keep purchasing from them.
— Liz
Easy company to order from. I'm using the test tubes to put in containers I use for my houseplants growing in water. The tubes came well wrapped for no breakage!
— Irene KozeeLady
Indigo Instruments is easy to work with , always fast delivery. Test tubes make great vases.
— Steven
These test tubes are exactly what I needed to fit in my vase. This is the only company I found that was able to sell them individually and at a reasonable price. I purchased 10 or so and all arrived well packaged and good quality. Thank you so much!
— Lori
Love the durability of these large test tubes. Great to be able to purchase individually for craft projects and horticulture displays. Competitively priced and shipped promptly. I purchase all my lab glass from Indigo!
— Cathy
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