---
product_id: 157064898
title: "305 Cartesian Diver Apparatus, Single Glass, 1/2\" Height x 3/8\" top x 9/32\" Bottom"
price: "¥3895"
currency: JPY
in_stock: true
reviews_count: 7
url: https://www.desertcart.jp/products/157064898-305-cartesian-diver-apparatus-single-glass-1-2-height-x
store_origin: JP
region: Japan
---

# buoyancy & pressure demo 2.5" precision glass diver red visibility band 305 Cartesian Diver Apparatus, Single Glass, 1/2" Height x 3/8" top x 9/32" Bottom

**Price:** ¥3895
**Availability:** ✅ In Stock

## Summary

> 🔬 Dive into science with precision and style!

## Quick Answers

- **What is this?** 305 Cartesian Diver Apparatus, Single Glass, 1/2" Height x 3/8" top x 9/32" Bottom
- **How much does it cost?** ¥3895 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/157064898-305-cartesian-diver-apparatus-single-glass-1-2-height-x)

## 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

- • **Visible Red Band:** Distinct red neck band guarantees easy tracking in any liquid environment—never lose sight of your diver.
- • **Replacement Ready:** Ideal as a direct replacement unit or a standalone tool for innovative science experiments at home or in the lab.
- • **Compact & Portable:** At just 2.5 inches tall, it fits seamlessly into standard cylinders or soda bottles for versatile use.
- • **Educational Impact:** Perfect for demonstrating core physics concepts like buoyancy and atmospheric pressure in a visually engaging way.
- • **Handcrafted Precision:** Expertly blown glass ensures a flawless, durable Cartesian diver for reliable experiments.

## Overview

The 305 Cartesian Diver Apparatus is a handcrafted, 2.5-inch blown glass tool featuring a red band for visibility. Designed to visually demonstrate buoyancy and atmospheric pressure, it fits standard cylinders and soda bottles, making it perfect for educational and experimental use in labs or classrooms.

## 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 |
|---------------|-------|
| Customer Reviews | 2.1 out of 5 stars 46 Reviews |

## 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

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

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-12*