Railway gap ruler for rail gap measurement Rail Feeler Gauge 0.02 mm, 0.03 mm, 0.05 mm, ,0.25 mm, 0.30 mm, 0.35 mm ,0.40 mm,0.45 mm, 0.50 mm, 0.55 mm ,0.6 mm ,0.7 mm , 0.75 mm, 0.8 mm,0.85 mm ,0.9 mm, 0.95 mm,1.00 mm. Steel ruler -2~17.5 cm Gap ruler 5-30 m m
