Four Instruments to help with HVAC Electrical Installations Kit Contains 3419-20 Temperature Gun 8 to 1 Optical Resolution -20 Deg F to 932 Def F Adjustable Emissivity 0.17 to 1.00 80 Hrs Operation on AA bateries 3804 Digital Multimeter AC and DC Voltage and Current Measurement Resistance and Continuity Rubber Boot RS-232C Interface 3120 Voltage Probe Red Indicator for Voltage Presence, Green for Battery Check 200 Hours on 2AAA batteries User Replaceable Batteries 3280-10 Clamp On Meter 1000A AC Current Capable Lightweight Independent Jaw Opening Design Resistance and Continuity