Our redesigned Test-Master® Testing Screen delivers accurate particle size separations for large samples and now features an easily controlled, integrated hopper for easier introduction of sample material. Vertically hinged front panel doors offer improved access and clearance while reducing nuisance dust. Internal rotating counterweights of the Test-Master® drive system equalize the vertical screening action for smooth, quiet operation. Standard vibration characteristics are designed for coarse materials of mid-range density such as limestone or gravel aggregates. The Test-Master is also ideal for coal, coke, ore and many other dry, granular materials.