Hitachi C42 Instruction Manual page 16

c)
Place the magnetic sensor attachment on the probe with the correct
direction as shown in Fig. 5.
When not using a Needle Guide Bracket
Fig. 5 How to attach the Magnetic sensor attachment
Projected part of
the Magnetic sensor
attachment
Fit the insertion
direction
Index mark
When using a Needle Guide Bracket
-10-
Slit of the
Magnetic sensor
attachment
Fit the insertion
direction
Needle guide bracket
Q1E-EP1359