产品描述：
Box Section Spirit Level
Box-section lightweight extra strong frame with soft-ribs' for strength and finger grip.
Accuracy:
Horizontal 0.029 (0.5mm/m);
Vertical 0.048 (0.75mm/m).
80A-2
Features two vertical and one horizontal vials accurate to 0.5mm per metre. Vials guaranteed to remain accurate for 10 years. Electrostatic powder coated abrasive resistant frame.