The gap between the probe tip and the accessory surface during measurement, in centimeters. Magnetic field strength falls off rapidly with distance, so the standoff must be consistent across all measurement points to make readings comparable. For discs and pancakes, place the probe directly on the surface (0 cm standoff). For loops, hold the probe at the midpoint of the tubing along an even horizontal plane.
Standoff distance is the gap between the coil surface and the point where the field is measured, or where the target sits. The field is strongest right at the coil and weakens quickly with distance, so a larger standoff means a weaker field reaches the target. Reported field values are always tied to the standoff they were measured at.
