Touch Testers

You can buy ready-made touch testers, or you can make them out of simple materials. Aim for points that are precise but not sharp. We like to use sets of 4 testers: a one-point tester, and two-point testers at 5, 15, and 30 mm apart.

Here are some ideas for DIY touch testers.

Toothpicks on an index card

Tape toothpicks to an index card or a square piece of cardboard so that the points stick out past the edge. You may want to break the toothpicks in half. Make a different tester on each edge and label each one.

Paper Clips

Unbend and re-bend paper clips so that their ends are separated by the specified distances. Larger sizes of paperclips are easier to work with. Pliers may make the bending easier.

Pins in a cork or stopper

Stick sewing pins into the sides and/or ends of a cork or a rubber stopper at the specified distances. For better precision, use pins with small heads.

Other ideas

  • Short, stiff pieces of wire in a block of Styrofoam
  • Toothpicks in a block of Styrofoam
  • Calipers
  • Forceps taped at fixed distances

APA format:

Genetic Science Learning Center. (2014, December 1) Touch Testers. Retrieved May 14, 2024, from

CSE format:

Touch Testers [Internet]. Salt Lake City (UT): Genetic Science Learning Center; 2014 [cited 2024 May 14] Available from

Chicago format:

Genetic Science Learning Center. "Touch Testers." Learn.Genetics. December 1, 2014. Accessed May 14, 2024.