M256A1 Chemical Agent Detector Kit The M256A1 Chemical Agent Detector Kit is capable of detecting and identifying hazardous concentrations of chemical agents in the air. This kit is used by the US military and others to identify the types of chemical agents present, such as nerve agents, blister agents, and blood agents. Material: Plastic. Contents such as chemical detection agents are not included. The case in the photos only. Size (approx.): Width 17.5cm, Height 12.2cm, Depth 8cm. Can be used for purposes such as storing emergency medical supplies.