This text is missing some spaces, please add them: 400Hzmeasurement:Byincreasingthepowerfrequencyto400Hz,transformersandmotorscanbemuchsmallerandlighterthanat50or60Hz,whichisanadvantageinaircrafts,submarines,spacecrafts,andothermilitaryequipmentandhand-heldtools.
400 Hz measurement: By increasing the power frequency to 400 Hz, transformers and motors can be much smaller and lighter than at 50 or 60 Hz, which is an advantage in aircrafts, submarines, space crafts, and other military equipment and hand-held tools.