Fluke 53 II B and 54 II B are contact thermocouple thermometers for industrial, laboratory and HVAC measurements. The 53 II B has one input; the 54 II B has two inputs and displays the T1−T2 difference. B versions support J, K, T, E, N, R and S thermocouples; the usable range depends on the selected probe. Internal memory stores up to 500 points at a user-selected interval, and a real-time clock records event time. A backlit display, Min/Max/Avg and electronic offset support everyday measurements. Optional FlukeView Forms software and a communication accessory provide PC transfer. The photograph shows the dual-input 54 II B.