---
product_id: 157064898
title: "305 Cartesian Diver Apparatus, Single Glass, 1/2\" Height x 3/8\" top x 9/32\" Bottom"
brand: "gsc international"
price: "3159 kr"
currency: ISK
in_stock: true
reviews_count: 8
category: "Gsc International"
url: https://www.desertcart.is/products/157064898-305-cartesian-diver-apparatus-single-glass-1-2-height-x
store_origin: IS
region: Iceland
---

# Responsive buoyancy demo 2.5" hand-blown glass precision Red band for instant visibility 305 Cartesian Diver Apparatus, Single Glass, 1/2" Height x 3/8" top x 9/32" Bottom

**Brand:** gsc international
**Price:** 3159 kr
**Availability:** ✅ In Stock

## Summary

> 🔴 Dive into physics with style and precision!

## Quick Answers

- **What is this?** 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?** 3159 kr with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.is](https://www.desertcart.is/products/157064898-305-cartesian-diver-apparatus-single-glass-1-2-height-x)

## 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

- • **Compact & Lightweight:** At just 2.5 inches tall and 0.16 ounces, it’s easy to handle, store, and integrate into any lab or classroom environment.
- • **Instant Visual Tracking:** The vibrant red band ensures you never lose sight of the diver during experiments—perfect for detailed observations.
- • **Versatile Compatibility:** Fits seamlessly into various cylinders or soda bottles, expanding your experimental possibilities beyond the basics.
- • **Precision Hand-Blown Glass:** Crafted for clarity and durability, this diver elevates your science setup with artisanal quality.
- • **Dynamic Buoyancy Demonstration:** Watch physics in action as the diver rises and falls with pressure changes, making abstract concepts tangible.

## Overview

The 305 Cartesian Diver Apparatus is a handcrafted, 2.5-inch tall blown glass tool featuring a distinctive red band for visibility. Designed to visually demonstrate buoyancy and atmospheric pressure changes, it fits standard cylinders and soda bottles, making it a versatile and elegant addition to any scientific or educational setting.

## 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: Do not buy - It is the wrong size. It is way too small.
Review: Too small - To small couldn’t find it after I put it down

## 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 | #340,182 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #247 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

![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

### ⭐ Do not buy
*by R***N on February 19, 2026*

It is the wrong size. It is way too small.

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

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

### ⭐⭐ 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.is/products/157064898-305-cartesian-diver-apparatus-single-glass-1-2-height-x](https://www.desertcart.is/products/157064898-305-cartesian-diver-apparatus-single-glass-1-2-height-x)

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*Product available on Desertcart Iceland*
*Store origin: IS*
*Last updated: 2026-03-13*