---
product_id: 6629443
title: "Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U2 (Pack of 1)"
price: "$21.45"
currency: USD
in_stock: true
reviews_count: 8
url: https://www.desertcart.us/products/6629443-plastic-test-tube-rack-for-15-18-mm-tubes-hole
store_origin: US
region: United States of America
---

# 18.7mm hole diameter Detachable 3-layer design Holds 50 tubes Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U2 (Pack of 1)

**Price:** $21.45
**Availability:** ✅ In Stock

## Summary

> 🧪 Elevate your lab game—store smarter, not harder!

## Quick Answers

- **What is this?** Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U2 (Pack of 1)
- **How much does it cost?** $21.45 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/6629443-plastic-test-tube-rack-for-15-18-mm-tubes-hole)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Lightweight & Durable:** Made from lab-grade polystyrene, this rack is both sturdy and portable—perfect for on-the-go professionals.
- • **Maximize Your Lab Space:** Compact yet spacious rack holds up to 50 tubes, doubling your storage capacity without clutter.
- • **Modular & Detachable Layers:** Three-layer design with easy slide-in shelves lets you customize your setup for ultimate convenience.
- • **Cost-Effective Lab Essential:** Top-ranked and budget-friendly, it delivers premium functionality without the hobbyist markup.
- • **Precision Fit for 15-18mm Tubes:** Engineered with 18.7mm holes to securely cradle standard test tubes and vials, ensuring stability.

## Overview

The Karter Scientific 208U2 Plastic Test Tube Rack is a lightweight, durable, and detachable 3-layer rack designed to hold up to 50 test tubes with diameters between 15mm and 18mm. Crafted from laboratory-grade polystyrene, it offers a secure fit with 18.7mm holes and a smart layered design to keep tubes steady, making it an efficient and cost-effective solution for professional and hobbyist lab storage needs.

## Description

Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U2 (Pack of 1): Science Lab Tube Racks: desertcart.com: Industrial & Scientific

Review: Cost effective ink sample storage - Not the most sturdy item ever, but I appreciate the fact that it can be stored flat and works as intended. I'm using it to store 5ml vials that contain sample sizes of fountain pen ink. This holds twice as many vials as the (admittedly nicer) acrylic model I was looking at elsewhere, but costs nearly two-thirds less and fits my available space better. I love it when I can avoid the "hobby item mark up" by finding the non-hobby item that does the same thing just as well or better.
Review: Great Value - Affordable, functional.

## Features

- 50 hole,Diameter: 18.7mm/0.74"
- These are great for making homemade chapsticks, storing ink samples, test tubes, lip balm, great for holding small cylinders upright
- Suitable for test tubes with an OD ranging from 15mm to 18mm
- The test tube rack are made of laboratory grade polystyrene, durable and light weight, easy to carry, not autoclavable
- The test tube has 3 Layer, 2 slots, each layer has a direction, slide the shelves in from one side, the other side has a lip that stops it, fits very snug. The stand has three layers of holes with a smallest hole at the bottom to keep tubes steady, and the large holes on the second and the top floor

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B005Z4QWIK |
| Best Sellers Rank | #5,573 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Lab Tube Racks |
| Date First Available | October 24, 2011 |
| Department | girls |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.01 ounces |
| Item model number | 208U2 |
| Manufacturer | Karter Scientific |
| Package Dimensions | 10.51 x 5.04 x 1.02 inches |

## Images

![Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U2 (Pack of 1) - Image 1](https://m.media-amazon.com/images/I/71FFiF6FJUL.jpg)
![Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U2 (Pack of 1) - Image 2](https://m.media-amazon.com/images/I/51rePQCRq8L.jpg)
![Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U2 (Pack of 1) - Image 3](https://m.media-amazon.com/images/I/512bwr2cgIL.jpg)
![Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U2 (Pack of 1) - Image 4](https://m.media-amazon.com/images/I/51P7aMdto0L.jpg)
![Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U2 (Pack of 1) - Image 5](https://m.media-amazon.com/images/I/516NnjOucgL.jpg)

## Available Options

This product comes in different **Size, Style** options.

## Questions & Answers

**Q: what is the dimensions , L X W X H?**
A: 10.25" x ~4.75" x ~2.75"The W and H are a little shorter than mentioned, but I was being lazy. I use this rack for holding test tubes for aquarium chemical level tests. Works pretty well for me. Kind flimsy if you don't put in the middle shelf. It's strong enough for me to carry it with one hand from one of the legs.The top of the first shelf is about .5" off the table. The top of the top shelf is 2.5"  off the table.

**Q: Would this be able to hold up a tube that's 15 cm long?  I want to make sure the tubes I use arent too long.**
A: I purchased this rack intending to use it for 15 cm tubes of beads, however I found it is not ideal for tubes that long.  It will hold them, but they flop around a lot and this causes the "shelves" of the rack to start sliding out.  A taller rack or one with shelves that were fixed in place would be better.

**Q: Is this autoclavable?**
A: No, it is light duty plastic I would not trust for an autoclave.

**Q: can top slide be left off so that essential oil roller vials could fit?**
A: Hello Delores, Thank you for your interest in our product. This rack is detachable, therefore, you would be able to take off the top slide.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Cost effective ink sample storage
*by S***. on July 7, 2025*

Not the most sturdy item ever, but I appreciate the fact that it can be stored flat and works as intended. I'm using it to store 5ml vials that contain sample sizes of fountain pen ink. This holds twice as many vials as the (admittedly nicer) acrylic model I was looking at elsewhere, but costs nearly two-thirds less and fits my available space better. I love it when I can avoid the "hobby item mark up" by finding the non-hobby item that does the same thing just as well or better.

### ⭐⭐⭐⭐⭐ Great Value
*by R***E on February 7, 2026*

Affordable, functional.

### ⭐⭐⭐⭐⭐ No tools required to assemble.
*by D***A on November 20, 2025*

This is a cute shelf and great for chapstcks.

## Frequently Bought Together

- Plastic Test Tube Rack for 15/18 mm Tubes, Hole Diameter is 18.7mm, Holds 50, Detachable, Karter Scientific 208U2 (Pack of 1)
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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-23*