Disposable diabetes test monofilaments are medical devices used to test for neuropathy in people with diabetes. Neuropathy is a common complication of diabetes that can lead to numbness, tingling, and loss of sensation in the feet and legs. This can be a serious problem because people with neuropathy may not be able to feel injuries or infections in their feet, which can lead to serious complications such as ulcers, infections, and even amputations.