: Engineer’s rods use a decimal system (feet, tenths, and hundredths) for high precision.

: In medicine, specialized stainless steel rods measure internal anatomical dimensions during procedures like ear surgery. Historical Significance and Evolution Measuring Rod - Integra LifeSciences

: Grade rods measure vertical distances and elevations when used with a transit or laser level.

: Builder’s or architect’s rods use standard inches and fractions, making them familiar for general construction tasks.