Выражение встречается в следующем контексте:для проведения технических осмотров организация должна быть обеспечена площадкой для испытаний и комплектом аттестованных грузов.
Это Правила строительства и безопасной эксплуатации подъемников.
Возможно это быть, что то вроде, set of certified load blocks.

Заранее спасибо

Abstract:
A solid weight load testing system is disclosed for testing the load capacity of a crane. The apparatus includes a holder that includes a platform and a post, the post having upper and lower end portions and being structurally connective at its lower end portion to the platform. A plurality of weights are selectively placed upon the holder by a user in order to arrive at a selected capacity. Each weight has a central opening that is sized and shaped to fit the post as the weight is lowered to the platform. A pair of lifting eyes are provided on each plate, the lifting eyes being mounted to the periphery of a weight on a line that intersects the center of the weight opening. An attachment portion on the top of the post enables a connection to be perfected between the holder and a crane to be load tested. A crane lift line is rigged to the attachment portion after a selected plurality of weights have been added to the holder. The lifting eyes are peripherally positioned on the weight and extend generally away from the periphery of each weight so that the lifting eyes do not interfere with stacking of multiple of the weights.