To avoid this hazard, establish the freezing and boiling points of a sample before doing a variable temperature experiment. Can cause permanent damage to equipment or data. Strong magnetic fields surrounding a magnet can damage the strip of magnetic media found on most credit cards, ATM cards, and similar plastic cards. Floppy disks and tapes are also susceptible to damage inside this perimeter. Many wrist and pocket watches are also susceptible to damage from intense magnetism.
Tubes are fragile and can easily break.
The top of the sample tube can break off when the probe is removed. It is best to eject the sample before removing the probe from the magnet. Otherwise, use extreme caution when removing the probe if the sample is still in the probe. The NMR 400 wide bore has been equipped with high-power amplifiers for solids state NMR spectroscopy. Users should never operate these amplifiers with liquid probes.