This document lists various scientific instruments used to measure different physical quantities, including meters, vernier calipers, micrometers, balances, stopwatches, thermometers, measuring cylinders, ammeters, and voltmeters. It pairs common instruments with the physical quantities they are used to measure, such as meter rules for length, vernier calipers and micrometers for thickness and diameter, and electronic and beam balances and spring balances for mass.