This Fieldpiece HS35K31G Field pack is a genuine Fieldpiece pack perfect for HVACR professionals. This Field pack is an 8lb compact kit that includes the essential HVACR tools need for nearly any job you?ll go on. This Fieldpiece HS35K31G Field pack includes a Data logger, eight different accessory heads, and an electronic handle that makes each accessory head to be its own instrument. This kit has the capabilities to measure things like AC voltage, Relative humidity, and the temperature. This Fieldpiece HS35K31G Field pack comes with the outstanding protection of the Limited Fieldpiece Warranty. Fieldpiece is a company that is a company that?s been around for since 1990. They have made it their goal and mission to improve the tools that HVACRs use, to make their jobs easier and our homes more efficient.