The Gilson Test-Master® is a full feature screen shaker used for gradation analysis of sample batches up to a maximum of one cubic foot (0.028 m3). Two models are available. P-260 has a capacity of six screen trays and a dust pan. The P-26020 has a capacity of seven trays plus the dust pan. The Test-Master® uses the same screen trays as the Hydraulic and Manual Gilson Screen Shakers (P-261 and P-262). Designed primarily to separate materials with sizes in the range of 4 in (10.1 cm) to No. 4, it will also handle smaller amounts of finer materials down to No. 200.
The screening motion of these Shakers is essentially vertical vibration set at optimum for stone and gravel materials. The Shakers are driven by a 1/3 hp capacitor-type motor with built-in overload protection. Internal rotating weights equalize the action of the rotating mechanism to virtually eliminate vibration. Trays are clamped by hydraulic cylinders, operated by a convenient foot pedal. The Test-Master® has top and front covers to confine dust and reduce noise. A digital control panel displays elapsed time and allows operation timing to 99 minutes with reset, pause and resume controls.