要求主要是划线方箱各工作面不能有锈迹、划痕、裂纹、凹陷以及影响计量性能的其他缺陷。非工作面应清砂涂漆，棱边倒角。
精密V型架也可作方箱使用，带有夹持弓架的V型架，可以把圆柱形工件牢固的夹持在V型架上，翻转到各个位置划线。
Precision V type rack can also be used with a gripping, party box bow frame, can put a V type cylindrical workpieces firm grip in V type shelf, flip to each position crossed.
CHXY系列产品既能有效完成复杂零部件、模型的三维空间测量、测绘，又可替代方箱、划针、高度尺进行划线检测。
CHXY products can effectively complete complex parts, the model of three-dimensional measurement, mapping, can replace square box, plan-pin, high ruler for marking test.
一般方箱用于零部件平行度、垂直度和检验和划线，万能方箱用于检验或划精密工件的任意角度线。
General side box for parts parallelism, perpendicularity and testing and marking, universal side boxes designated for inspection or precision of the workpiece at any Angle line.
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