REFERENCES 
Touch Screen Monitors - Overview
A touch screen acts as an interface between humans and computers in an automation control unit. Unlike keyboards or mice, touch screens provide convenience and user-friendly access to receive information from one computer to another. Touch screens work by detecting touch points according to physical relations and are divided into three types: Resistive type, Capacitive type, and Acoustic or Infrared.  

IP and NEMA Ratings – What Do They Mean?
IP ratings are standards for electrical enclosures defined by the IEC (International Electrotechnical Commission). The rating refers to the degree of protection against water and dust provided by a computer's enclosure. The IP rating is expressed as a two-digit number (Example: IP-65). The first number designates protection from solids, while the second number designates protection from liquids.  On the other hand, NEMA ratings are standards that are useful in defining the types of environments in which an electrical enclosure can be used. The NEMA rating system is defined by the NEMA (National Electrical Manufacturer Association), and frequently signifies a fixed enclosure’s ability to withstand certain environmental conditions.