The Fluke 972B includes an internal sensor for standard indoor environments and an external sensor (Fluke 972ES) for expanded measurement capabilities in challenging locations. • Accuracy of ± 0.5 °C and ± 3% RH, to meet industrial grade testing requirements. • 99 sets of stored data, easy to review. • Comfortable grip and ergonomic design. • Reinforced sensor protective cover for worry-free operation. • Data logging in 5 minute intervals.