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Bacteria Growing Kit - Science Fair Size

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Product Info



If you are looking to gross out some friends and family (and carry out serious scientific analysis at the same time) you will want to try out our bacteria growing kit. It includes everything you need to get started - you just supply water and bacteria (don't worry, it's everywhere.) This is perfect for science fair experiments because so many variables can be tested for bacteria growth such as:

  • Is a dog's mouth cleaner than a human's mouth?
  • How long do bacteria live on a surface?
  • Do antibacterial soaps effectively kill bacteria?
  • Where is the most bacteria in your school?
  • Which door handle in the school has the most bacteria?
  • Does toothpaste kill bacteria in your mouth?
  • Do dark socks create more bacteria in a shoe than white socks.
  • Which surface cleaner kills the most bacteria?

Our science fair kit includes:

  • 6 large (10 cm wide) plastic Petri dishes
  • Nutrient agar powder for creating the growth medium for the bacteria
  • 6 Extra-long wooden shaft cotton swabs for collecting samples
  • Beaker for preparing the agar (not shown)
  • Stirring stick
  • Complete instructions to carry out your experiment

In the right conditions, the bacteria usually starts growing in 4-5 days. Components are non-sterile and are not intended for medical use. For ages 8 and above with adult supervision.

Customer Feedback:
Brandon from South Carolina used this kit to test whether or not double-dipping a chip spreads bacteria. His mom, Amy, writes: "My son won 1st place overall for his school!!! He wowed the judges and now is heading to the local University for the area competition in three weeks. I am so glad you were able to assist us. Thanks again and we look forward to working with your products in the future." Congratulations Brandon!


What to do with my cultures when I am finished with my experiment?

  • When your experiment is complete, always dispose of your cultures properly.
  • Always destroy the microorganisms before disposing of dishes in the trash.
  • Have an adult pour a small amount of a strong disinfectant such as household bleach over the colonies while holding the Petri dish over a sink.
  • Caution - never allow any strong disinfectant such as bleach touch your skin, eyes or clothes. It may burn! Always get help from an adult.




Which area of your school has the most bacteria? 


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Shannon K. writes: Some of our over achievers from my sons class! These are after a week.

Sara B. writes: My family and I had a blast making our gross discoveries in the Petri dish! We tried three different swabs for one container. Behind the kitchen sink, behind the bathroom sink, and the toilet handle. Ew gross lol. So much fun!! Thanks!


Product Reviews

Previous | Showing reviews 11-18 of 18

  1. Bacteria Growing Kit

    Posted by Debbie Barcus on 12 01 2013

    We were very satisfied with the kit we received and are currently conducting an experiment with it.
    Thank you for your service.

  2. science fair buddy

    Posted by morgan on 11 21 2013

    great product test 3times for true results

  3. Awesome!!!

    Posted by Unknown on 09 21 2013

    It was easy for my son to do and he had fun while hewas learning.

  4. Shipped & Received Promptly

    Posted by Elizabeth German on 05 10 2013

    I am the Grandmother to a 9 1/2 year 3rd grader. When she said she wanted to do her Science Fair Project on bacteria titled "unwanted house guests", I decided to go on the internet and there I found the Science Guy. While everything she needed came in the package, we could of used a few more swabs. But other than that, the kit was great, down to the instruction sheet. We will order again from the Science Guy when the time comes. Oh, and by the way...my Grandaughter won 1st Place out of 50 entries!

  5. My Son won 1st place

    Posted by Unknown on 03 12 2013

    We bought this so my son could test 5 different objects to see which one had the most bacteria. He won 1st place out of 4 schools for his project. It was easy to use and the instructions were easy to read.

  6. Interesting experiment idea

    Posted by Eileen on 01 04 2012

    My daughter used the bacteria growing kit to figure out which cleaner cleaned our kitchen counter of germs the best. The instructions are clear and easy to follow. (We boiled over some of the agar, but there was plenty left.) It is interesting watching and charting the samples (colonies) as they grow. We will go to present to the judges at the end of next week. Thanks for a great product.

  7. Science Fair Winner

    Posted by Yvonne on 11 15 2011

    I wanted to e-mail to let you know how pleased we were with your product! We purchased the Science Bob Bacteria Growing Kit Science Fair Size. My daughters project was titled "Wash Your Hands!" and it won the 3rd grade Science Fair at her Elementary School in New York! The directions were easy to follow & it was fun to watch the germs grow. Her project is now going to Brookhaven National Laboratory for further judging....we hope she will place in that fair as well! Thanks again!

  8. Great

    Posted by betty bergstein on 01 30 2011

    Well my daughter, Carmen, was doing a project and she had her topic, is there more bacteria in tap water than regular water, and she won 1st place in the fair. Thank you sooooooo much!

Previous | Showing reviews 11-18 of 18