---
product_id: 400459545
title: "Ada Twist, Scientist Light and Reveal Pen with Invisible Ink, Lights Up and Plays The The Hypothesis Song, Accessory for Scientist Dress-Up Set, Kids Toys for Ages 3 Up by Just Play"
brand: "just play"
price: "VT6481"
currency: VUV
in_stock: true
url: https://www.desertcart.vu/products/400459545-ada-twist-scientist-light-and-reveal-pen-with-invisible-ink
store_origin: VU
region: Vanuatu
---

# Plays The Hypothesis Song Includes secret message notepad Invisible ink reveal light Ada Twist, Scientist Light and Reveal Pen with Invisible Ink, Lights Up and Plays The The Hypothesis Song, Accessory for Scientist Dress-Up Set, Kids Toys for Ages 3 Up by Just Play

**Brand:** just play
**Price:** VT6481
**Availability:** ✅ In Stock

## Summary

> 🔬 Unlock the secret world of science and fun with Ada Twist’s Light & Reveal Pen!

## Quick Answers

- **What is this?** Ada Twist, Scientist Light and Reveal Pen with Invisible Ink, Lights Up and Plays The The Hypothesis Song, Accessory for Scientist Dress-Up Set, Kids Toys for Ages 3 Up by Just Play by just play
- **How much does it cost?** VT6481 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/400459545-ada-twist-scientist-light-and-reveal-pen-with-invisible-ink)

## Best For

- just play enthusiasts

## Why This Product

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

## Key Features

- • **Sing Along to Science:** Press the button to hear Ada Twist sing the catchy Hypothesis Song, turning learning into a fun jam session.
- • **Illuminate Your Secrets:** Write invisible messages and reveal them with a built-in light—perfect for little scientists in the making.
- • **Authentic Scientist Vibes:** Modeled after the pen from the hit Netflix show, it’s the ultimate accessory for budding STEM enthusiasts.
- • **Foster Curiosity & Teamwork:** Encourages kids 3+ to explore friendship, creativity, and the thrill of scientific exploration together.
- • **Ready to Play Out of the Box:** Comes with 3 AG13 batteries included—no waiting, just instant scientific discovery.

## Overview

Inspired by the Netflix series, this multi-functional pen features invisible ink writing, a reveal light, and plays The Hypothesis Song. It includes a notepad for secret messages and comes with batteries installed, making it an engaging STEM toy for kids aged 3 and up.

## Description

Ada Twist, Scientist Light and Reveal Pen with Invisible Ink, Lights Up and Plays The The Hypothesis Song, Accessory for Scientist Dress-Up Set, Kids Toys for Ages 3 Up by Just Play

## Features

- This Ada Twist, Scientist pen features lights, phrases, music and includes a notepad. Press the pen's button to hear Ada sing "The Hypothesis Song"!
- Write a message on the notepad with the invisible ink pen and shine the light to reveal the hidden message.
- Looks just like the one Ada uses on Netflix’s preschool show and makes a great accessory for the Ada Twist, Scientist Dress-Up Set.
- Bring home the the rest of the Ada Twist, Scientist toys and let your child explore the fun of friendship, scientific discovery, and teamwork.
- Requires 3 x AG13 batteries (included).
- Ages 3+

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Manufacturer | Just Play |
| Brand | Just Play |
| Model number | 31906 |
| Product Dimensions | 12.07 x 5.08 x 17.78 cm; 115 g |
| Batteries | 3 LR44 batteries required. (included) |
| Color | Multi-color |
| Closure | button |
| Material Type | Plastic |
| Number of Items | 1 |
| Size | Medium |
| Sheet Size | A4 |
| Manufacturer Part Number | 31906 |
| Item Weight | 115 g |

## Product Details

- **Colour:** Multi-color
- **Sheet size:** A4
- **Brand:** Just Play
- **Sheet count:** 3
- **Manufacturer:** Just Play

## Images

![Ada Twist, Scientist Light and Reveal Pen with Invisible Ink, Lights Up and Plays The The Hypothesis Song, Accessory for Scientist Dress-Up Set, Kids Toys for Ages 3 Up by Just Play - Image 1](https://m.media-amazon.com/images/I/51pVD6+ABxL.jpg)

## Frequently Bought Together

- Ada Twist, Scientist Light and Reveal Pen with Invisible Ink, Lights Up and Plays The The Hypothesis Song, Accessory for Scientist Dress-Up Set, Kids Toys for Ages 3 Up by Just Play
- Just Play Ada Twist, Scientist Glow and Go Notebook, Lights Up and Plays the ''The Why Song'', Includes Experiment Card, Kids Toys for Ages 3 Up
- Just Play Ada Twist, Scientist Ada Twist Lab Doll, 12.5 Inch Interactive Doll with Research Lab Accessories, Talks and Sings the ''The Brainstorm Song'', Kids Toys for Ages 3 Up

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-02-27*