Abney level 5 1/ 4" 133 mm long with radius arc graduated 0 to 90 degree in both directions, with vernier reading to 10 minutes and a percent of grade scale from 0% to 100% . Complete with....
Features : * including Lanyard & skylon case calibrated for an accuracy * framework is of corrosive resistant light-weight aluminium * scale card is supported by a jewel bearing assembly * all....