Another lightweight chemical detector is on the market and Australia has bought several hundred of the one pound LCD3 (made by Smiths Detection in Maryland). The device simultaneously detects and identifies several types of chemical weapons at less than harmful concentrations. An audible and/or visual alarm goes off and warns troops to put on their chemical protection gear. A major problem with chemical detectors is that, while they do well in tests, they often degrade during field use and eventually become useless.