Here are the media queries I drop into every project I begin. They pretty much cover every screen size.
// Large Screens
@media only screen and (min-width: 1200px) {}
// Desktop
@media only screen and (min-width: 960px) and (max-width: 1199px) {}
// < Desktop
@media only screen and (max-width: 1199px) {}
// Tablet
@media (min-width: 768px) and (max-width: 959px) {}
// < Full Tablet
@media (max-width: 767px) {}
// Small Tablets, not phones
@media only screen and (min-width: 481px) and (max-width: 767px) {}
// Phones - large
@media only screen and (max-width: 480px) {}
// Phones - small
@media only screen and (max-width: 330px) {}