The tiny kit called Ampli, uses modular blocks that can be connected in different patterns to replicate the function that would typically be built into a manufactured test for pregnancy, glucose, or an infection or other disease. Pregnancy tests made by a medical device company, for example, use an antibody added to a paper strip that reacts to a hormone that women produce when pregnant, and that reaction causes the paper to change color. The new blocks can create the same test without the complexity of embedding elements in paper ahead of time. It can also perform tests that are typically done with test tubes in a lab, such as a test that carefully mixes three chemicals to see if someone has taken medicine for TB. With the kit, no lab is needed, and the test costs $1.