Hart Scientific 1504 Ref Thermometer vs Fluke 1523 Ref Thermometer 

Hart Scientific                 Fluke 
17.0133			17.010
17.0132			17.0095
18.9994	                        18.995
18.9962			18.992
18.9954			18.991
18.9939			18.990
20.7482			20.744
20.7474			20.744
20.7441                         20.741
20.7434                         20.740