Electronic Sensor Technology, Inc. is a provider of homeland security solutions. The Company has developed and patented a chemical vapor analysis process. This process applies gas chromatography calculations and technology to a variety of industries, including homeland security, life sciences, chemical and petrochemical, food and beverage, and environmental. The Company's zNose product portfolio includes four models, such as Model 4200 PORTABLE zNose, Model 7100 BENCHTOP zNose, Model 4650 COMPUTER INTEGRATED zNose, and Model 4300 BATTERY OPERATED zNose. Model 4200 Portable zNose detects and analyzes all types of vapors. This portable odor analyzer identifies traces of organic, biological and chemical compounds with accuracy and speed. Model 7100 Benchtop zNose can analyze and quantify chemical odors associated with any chemical or biological process. The Model 4300 Portable battery operated zNose detects and analyzes all types of vapors.