Clarke ET135 12″ Engineers Rule Description A standard 300mm Stainless Steel measure for the precision engineer. £12.54 In stock Clarke ET135 12" Engineers Rule quantity Add to basket EAN: 5016086101680 SKU: 1700295 Category: Engineering Hand Tools - Measuring Equipment Description Specification Manufactured from stainless steel Calibrations etched in imperial and metric. Related products Clarke ET152 Steel Machinist Square (300mm) £32.51 Clarke ET133 3 Piece Spring Caliper Set £19.81 Clarke ET134 6″ Pocket Rule £10.49 Clarke ET151 Steel Machinist Square (250mm) £28.98