图 3 : （毫）特斯拉计（测量磁场强度的装置）
This instrument is designed for accurate measurement and display of direct and alternating magnetic fields. It has a large 3 1/2 LED digits display. The field direction is indicated by the sign for direct fields. The field is displayed through the range 0.00001 to 2 T in three selectable ranges together with a zero adjustment. Calibrated, so that no calibrating magnets or coils are required. Requires an axial or tangential probe as an accessory.
