The Fieldpiece Dual-Temperature Accessory, Model ATH4, Measures Two Temperatures Simultaneously Using The Included K-Type, Wrap Tab Beaded Thermocouples. The Technology Inside The ATH4 Provides Superior Temperature Compensation In Rapidly Changing Environments Commonly Found While Performing Field Service. Use The ATH4 To Find Delta T and Just About Any Temperature Split You Want To Measure. Displays T1, T2 and T1-T2 On Your Fieldpiece Meter, Handle or Data Logger. It Is Included with The HVAC Guide ½ System Analyzer To Get Target Superheat and For The Target Evaporator Exit Temperature Test. Fieldpiece Offers A Wide Variety Of K-Type Thermocouples For Various HVAC Specific Applications. Use Pipe Clamp T/Cs with The ATH4 To Check For Blocked Filters. Use Wet and Dry Bulb. Thermocouples To Find Target Superheat.