Sometimes the temperature does not decrease with height in the troposphere, but increases. Such a situation is known as a temperature inversion. Temperature inversions limit or prevent the vertical mixing of air.
Middle range machines can cost on average $400 and are often multi-function with copier and laser printer capabilities. Finally, high-end machines which offer high speeds, high capacity and high resolution come at a higher price-expect to pay $1000 - $2500 for such a fax machine.
Mid-range models will cost anywhere from $2,000 to $8,000 and usually have digital technology. The super fast high-end machines can go up to $50,000 or more. 1  The Lexmark X864DHE 4 Mono Laser Printer/Scanner/Copier/Fax is $11,000 new.