The 1502A Tweener features accuracy up to 0.006 C (the 1504 is even more accurate, up to 0.002 C). In addition, it reads 100-ohm, 25-ohm, and 10-ohm probes, has a resolution of 0.001 C across its entire range, and is the smallest unit in its class. It also has an optional battery pack for completely portable operation.Each Tweener is programmable to match a probes constants for maximum linearity and accuracy. All probe constants and coefficients are programmed through simple, front-panel keystrokes. Temperature is displayed in C, F, K, or resistance in ohms.