Phase IV Engineering designs specialized wireless sensor solutions to give you the cutting edge. Our miniature wireless sensors use the latest battery-free RFID technology and ultra-low-power, ultralong-life battery-powered designs to measure temperature, humidity, pressure, tamper, shock and more. Phase IV Engineering is a leading innovator, designer, and manufacturer of wireless and RFID sensors and systems. Let us design a custom or semicustom sensor system for your unique situation.