These 38x200mm (1.5x8") giant glass test tubes, have a nominal outside diameter of 38mm. 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. Rubber o-rings are generally available in hardware or plumbing supply stores. We do not sell O-rings.
38x200mm (1.5x8") giant size test tubes
1.5mm thick walled borosilicate glass
165mL-5.5 fl. oz capacity
50% discount when bought by case
optional tapered corks, for singles see Related Products below or:
38x200mm tubes have rounded bottoms & require support to stand upright
Completely unmarked for branding message
38mm (~1.5"); 200mm (~8")
Tube capacity/volume is ~165mL/5.5 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 (12)
What customers say in Google Reviews (click on names for full review):
Holly Christensen: ...very well packaged, quick delivery times, high quality test tubes...great service!
Dave Mertz: The large test tubes were perfect for a vase project I wanted to do. The price was right and the shipping was very fast...great service!"
Kerri Kairdolf: Perfect size ...great quality...arrived quickly with no damage.
Deshana Barua...glass tubes to display my propagations...prices are very reasonable (it’s impossible to buy just a single piece from online retailers like Amazon...more
Anna Hovius: ..pleased with...Indigo Instruments - very helpful, very courteous and polite..you handled my very small purchase - like it was a...more.
Lindsay McLennan: Great service! I forgot to order the corks with my tubes... they..shipped out that day...arrived...within 4 days! WOW! Great company to deal with...
2024-05-29
Great product, quick delivery, well packaged and, it was a hard to find product until I found Indigo.
— Catherine
2023-05-29
I purchased 38x200mm test tubes to replace rain gauge tube that broke & I could not locate any other option local/online that would fit the - apparently - special size for the rain gauge. While I was disappointed the test tubes did not have incremental markings (for rain measurement), since the test tube fit the rain gauge perfectly, I was able to transfer markings from prior/broken tube to the new test tube. Subsequently, able to use the new test tube for my rain gauge.
— Sue
2022-11-24
These are really high quality and perfect for my propagation wall.
— Erica
2022-10-18
Great quality glass, well packaged and just what I needed. Will definitely be buying from indigo in the future.
— Greg
— Indigo:
Thank you for your kind words. Glad we could get you what you needed.
2021-03-17
Tubes were correctly size and quantity. Also, very well wrapped to protect from breakage.
— Robert
— Indigo:
Good to know, thanks.
2021-03-13
My test tubes arrived quickly and were exactly what I was looking for. Packaged very well for shipping!
— Lauren
— Indigo:
Thanks for letting us know.
2021-02-09
I was shocked by how quick my test tubes arrived! I had such a wonderful experience with customer service after there was an issue with my card & bank. Super happy with the quality, my tubes arrived unharmed and well packaged.
— Haley
— Indigo: Thank for for kind words, glad we could help.
2020-04-21
Just the right test tube with the quality that I was looking for, they look excellent for my project.
— Mahmood
2019-06-18
The test tubes were exactly as described but 3 of the 12 were broken upon arrival. Indigo replaced the broken tubes after I contacted them. Great service!
— Douglas
2019-05-18
Product just as expected. Well packaged, flawless customer experience. Thanks! :)
— Zmonde
2019-04-07
These test tubes are big and just the size I was looking for for a project. Shipped securely in bubble wrap.
— Christine
2018-04-22
These are exactly as stated. Perfect for my project.
Thank you for your kind words. Glad we could get you what you needed.