Group3 probe at 1st negative pole minumum reading is 0.49385 T  compared to 0.49039 for the Lakeshore

Ratio Group3/Lakeshore = 1.007,  difference = 0.00346 T = 34 G

Group3 probe at 1st positve pole minumum reading is -0.48706 T  compared to -0.48317 for the Lakeshore

Ratio Group3/Lakeshore = 1.008,  difference = -0.00389 T = -38.9 G