---
product_id: 157064898
title: "GSC International 305 Cartesian Diver Apparatus, Single Glass, 1/2\" Height x 3/8\" top x 9/32\" Bottom"
brand: "gsc international"
price: "€ 22.05"
currency: EUR
in_stock: true
reviews_count: 7
category: "Gsc International"
url: https://www.desertcart.sk/products/157064898-gsc-international-305-cartesian-diver-apparatus-single-glass-1-2
store_origin: SK
region: Slovakia
---

# Precision buoyancy demo 2.5" hand-blown glass diver Red visibility band GSC International 305 Cartesian Diver Apparatus, Single Glass, 1/2" Height x 3/8" top x 9/32" Bottom

**Brand:** gsc international
**Price:** € 22.05
**Availability:** ✅ In Stock

## Summary

> 🔬 Dive into science with style and precision!

## Quick Answers

- **What is this?** GSC International 305 Cartesian Diver Apparatus, Single Glass, 1/2" Height x 3/8" top x 9/32" Bottom by gsc international
- **How much does it cost?** € 22.05 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sk](https://www.desertcart.sk/products/157064898-gsc-international-305-cartesian-diver-apparatus-single-glass-1-2)

## Best For

- gsc international enthusiasts

## Why This Product

- Trusted gsc international brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Visible Red Band:** The vibrant red neck band guarantees easy tracking during experiments, eliminating guesswork.
- • **Replacement Ready:** Easily swaps into existing Cartesian diver setups or custom experiments, keeping your lab or classroom cutting-edge.
- • **Compact & Portable:** At just 2.5 inches tall, it fits seamlessly into standard cylinders or soda bottles for versatile use.
- • **Educational Impact:** Perfect for illustrating buoyancy and atmospheric pressure in a visually engaging way—ideal for STEM enthusiasts and professionals.
- • **Handcrafted Precision:** Each diver is a meticulously blown glass piece, ensuring authentic scientific demonstration and durability.

## Overview

The GSC International 305 Cartesian Diver is a 2.5-inch hand-blown glass apparatus featuring a red band for visibility. Designed for clear demonstrations of buoyancy and atmospheric pressure, it fits standard cylinders and soda bottles, making it a versatile and educational tool for scientific experiments and STEM learning.

## Description

A visual demonstration of buoyancy and atmospheric pressure. A glass Cartesian diver 2.5" tall rises and lowers in a column of water as the pressure is increased and decreased. Increased pressure is obtained by compressing a rubber sheet stretched over a water filled cylinder. Instructions included.

Review: Too small - To small couldn’t find it after I put it down
Review: Not worth it - It was bigger in the picture but was false advertisement. It's just 1 in. Really not worth it

## Features

- Hand crafted, blown glass piece, approximately 2.5" in height with a red band around the neck, making the diver visible when submerged in liquid
- Can be purchased as a replacement to the Cartesian diver unit or used in other cylinders or soda pop bottles experiments
- A red band around the neck of the diver helps make the diver visible
- Made in China

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00UCQN7EI |
| Best Sellers Rank | #248,298 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #148 in Lab Distillation Apparatus |
| Date First Available | March 7, 2015 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.16 ounces |
| Item model number | 305 |
| Manufacturer | GSC International |
| Product Dimensions | 0.6 x 0.76 x 2.25 inches |

## Images

![GSC International 305 Cartesian Diver Apparatus, Single Glass, 1/2" Height x 3/8" top x 9/32" Bottom - Image 1](https://m.media-amazon.com/images/I/517x7jD9kdL.jpg)

## Questions & Answers

**Q: It floats horizontally when at the top of bottled not squeezed, is it supposed to remain vertical at all times? If so, what is wrong?**
A: Fill the diver with a small amount of water.  Then put it in a cylinder or bottle leaving space in the container for air.  The bottle or cylinder will need to be closed.  When a cylinder is used, we stretch a piece of rubber dam over the mouth of the cylinder and secure it with a rubber band. 
When you squeeze the bottle or press down on the rubber dam, the water in the bottle will be forced into the diver which will increase the weight of the diver and it will sink.   When you release the pressure, the opposite will happen and the diver will float.

## Customer Reviews

### ⭐ Too small
*by L***A on December 2, 2025*

To small couldn’t find it after I put it down

### ⭐ Not worth it
*by W***N on March 9, 2024*

It was bigger in the picture but was false advertisement. It's just 1 in. Really not worth it

### ⭐⭐ it sucks
*by B***E on October 12, 2023*

It was not worth the cash. Nor it was not what I expected.

## Frequently Bought Together

- GSC International 305 Cartesian Diver Apparatus, Single Glass, 1/2" Height x 3/8" top x 9/32" Bottom
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**Shop now:** [https://www.desertcart.sk/products/157064898-gsc-international-305-cartesian-diver-apparatus-single-glass-1-2](https://www.desertcart.sk/products/157064898-gsc-international-305-cartesian-diver-apparatus-single-glass-1-2)

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*Product available on Desertcart Slovakia*
*Store origin: SK*
*Last updated: 2026-01-24*