Compact size 50 tests Explosive Residue Detection Test Kit EXPRAY-50 is a field test kit designed to detect and identify most of known explosive materials and explosives residues. The kits have been extensively used in battle field by US military forces and forensic investigations for last 18 years, and have been priceless in their expedition of the apprehension of terrorists and criminals. There is also useful for environmental capacities in which the kit has been utilized, it has proven to be the perfect combination of quick results (less than one minute per test), sensitivity (nanograms level), reliability, ease of transport (under two pounds), ease of operation (no special training and no power requirements), and inexpensive price (less than $3 per test) to accommodate specific detection needs.