Includes two YJACK Temperature Clamps, two YJACK Psychrometers, and one YJACK PATH Range Extender Wireless measurement of several parameters Clamp measures surface temperature of pipes up to 1.25? diameter Psychrometer can measure temperature, humidity, wet bulb, dew point, and more in ambient air or ventilation ducting YJACK PATH range extender connects and re-broadcasts up to six YJACK? devices and up to two P51-870 TITAN devices at one time Amplifies signal strength through difficult to penetrate barriers