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The eccentric frequency of the plate is another factor to consider, says Ed Varel, engineering project manager for Stone Construction Equipment. Lower eccentric frequencies (or vibrations per minute - vpm) are good for cohesive soils compaction. For asphalt and granular materials, contractors will want to look for a higher vpm, Varel says.

Contractors should also look at the plate itself. Is the plate made of cast ductile iron or steel? "A cast ductile iron base plate may be stiffer allowing for more efficient compaction of the material," Lewis says.

The shape of the base plate also affects compaction. A curved plate can make turning easier and prevent the plate from gouging the asphalt, Erbel says. How can you tell if the plate is curved? Erbel says to look underneath from the center of the plate to the edging. Although it is hard to notice, the plate will be slightly bent up, he says. The geometry of the plate is important for working in tight places, Varel adds.

Aside from the plate itself, contractors should make sure the plate compactor comes with a water tank. The water helps create a barrier between the hot asphalt and the cold compaction plate preventing the plate from sticking to the asphalt, Erbel says.

A new feature plate compactors might have is an anti-vibration handle. The anti-vibration handle cuts down on vibration transfer from the plate to the operator, creating more comfort for the operator. In addition to anti-vibration, Lewis suggests looking for a plate compactor with a central-mounted handle. "A central-mounted handle makes it easier to maneuver on the asphalt and is less apt to do any cutting or tearing of the material," Lewis says.