Table 1. Result of stability evaluation

A B C D
Temperature range (℃) 5.760 4.780 4.090 1.410
Temperature standard deviation (℃) 1.523 1.263 1.039 0.335
dF average (nT) -4.715 -5.538 -5.290 -0.569
dF standard deviation (nT) 1.168 1.183 0.743 0.586
Baseline range (nT) 6.582 4.168 3.223 2.632
Baseline standard deviation (nT) 1.539 1.313 0.920 0.665