Australian Geographic

Johnco: Salt Water Spider Kit

Johnco: Salt Water Spider Kit - Main image
$21.67 $30.95 In stock

Category: Kids Toys & Games Science

The Johnco Salt Water Spider Kit offers a fascinating look into clean energy and sustainable technology. Children can build their very own moving spider powered entirely by salt water — no batteries or electricity needed. With just a few drops of salt water, the eco-friendly spider scuttles across surfaces, demonstrating how alternative energy can bring mechanical creations to life.

This engaging STEM kit introduces the concept of fuel cells in a fun and accessible way, helping children understand how chemical reactions can generate power. It’s an ideal mix of creativity, engineering, and environmental awareness, encouraging hands-on experimentation and curiosity about the future of renewable energy.

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Customer Reviews (4.3 / 5 · 4 reviews)

David B. ★★★★★

The spider is surprisingly sturdy once assembled, and watching it crawl using just salt water genuinely impressed my kids. We’ve run it three times now, and it still moves fine with fresh salt solution.

Timothy ★★★★★

Watching my son’s face light up as he mixed the salt water and saw the spider legs start twitching was worth every penny. The assembly was straightforward enough for an 8-year-old with minimal help, and it’s genuinely cool to see clean energy in action without any batteries needed.

Adam ★★★★☆

My nephew loved building the spider, though getting the salt water mix just right took a few tries. The fact that it actually crawls without batteries is pretty cool.