#measuring instrument

• Actinograph — A structural meteorological instrument utilized for the continuous and automatic graphical recording of the intensity of direct and diffuse solar radiation onto a special chart called an actinogram. The device operates based on a bimetallic or thermoelectric system sensitive to temperature variations induced by solar rays, transmitting the mechanical movement to a recording arm with a pen that traces the radiant values curve onto a rotating drum.
• Actinometer — A structural meteorological and physical instrument utilized for measuring the intensity of radiant energy, specifically direct solar radiation. The device operates based on the absorption of rays by an ideal black body, converting luminous energy into heat, which is subsequently determined via thermoelectric or bimetallic methods, or by directly evaluating light-triggered photochemical reactions over a fixed time interval.
• Admittance meter — An electronic measuring instrument used for the direct or indirect determination of the electrical admittance of a circuit, device, or semiconductor material; a laboratory tool structurally designed to evaluate both the active component (conductance) and the reactive component (susceptance) under high-frequency alternating current conditions.
• Alkalimeter — An apparatus or laboratory instrument utilized in volumetric chemical analyses to measure the amount or concentration of free bases (alkali) in a liquid mixture. Historically, the term referred to special graduated glass vessels (early burettes), while in a modern context, it can describe automatic titration modules configured for basic determinations.
• Amylometer — A laboratory instrument designed for the quantitative determination or percentage measurement of starch within a solution, plant product, or cereal mass. The device usually operates on densimetric, optical, or refractometric principles, being a structural tool utilized in older analytical laboratories or starch factories for quick raw material control.
• Analyzer — An alternative or regionally admitted form for the term analyzer; it defines an instrument, apparatus, or anatomical system that executes an analysis. In physiology, it represents the biological network responsible for transforming excitations into conscious sensations, while in physics and engineering, it is a technical device programmed to measure and fragment the properties of an electrical signal, chemical mixture, or information flow.
• Aneroid — A mechanical instrument used to measure atmospheric pressure based on the elastic deformations of a hermetic metal capsule inside which a partial vacuum has been created. As an adjective, it describes any device, barometer, or sphygmomanometer that structurally functions without the use of any liquid (such as mercury), transmitting the capsule's volume variations directly to a pointer needle via a system of precision levers.
• Anesthesimeter — A precision apparatus, device, or technical instrument used in anesthesia and intensive care to measure, dose, or monitor the amount of volatile or gaseous anesthetic substance administered to a patient. This structural instrument ensures rigorous control over the concentration of the respiratory mixture in the circuit, guaranteeing that narcosis is maintained within optimal clinical safety limits.
• Anesthesimeter — A precision apparatus, device, or technical instrument used in anesthesia and intensive care to measure, dose, or monitor the amount of volatile or gaseous anesthetic substance administered to a patient. This structural instrument ensures rigorous control over the concentration of the respiratory mixture in the circuit, guaranteeing that narcosis is maintained within optimal clinical safety limits.
• Combustiometer — An industrial measuring instrument or laboratory device utilized for the precise determination of the flash point, flame propagation speed, or combustion temperature of various liquid or gaseous substances. In a structural-engineering sense, the ardometru operates based on thermoelectric sensors or optical cells that record rapid oxidation reaction parameters under controlled pressure and volume conditions.
• Argentometer — An industrial measuring instrument or laboratory device used in volumetric analysis (argentometry) to determine the concentration of halide ions in a solution or to measure the purity of silver alloys. In a structural-engineering sense, the modern argentometru utilizes potentiometric sensors or photometric cells capable of precisely detecting the equivalence point during titration with a standardized silver nitrate solution.
• Astatization — A technical process or structural method through which an oscillating system, a measuring instrument (such as a galvanometer or seismograph), or a regulator is brought into a state of astatism; this operation cancels or minimizes the elastic or gravitational restoring force, causing the system to remain in equilibrium regardless of its position or considerably increasing the device's sensitivity to external perturbations.
• Axometer — An apparatus, measuring instrument, or precision optical device utilized to determine the exact localization, geometric orientation, and alignment of the optical or geometric axes of lenses (especially cylindrical or toric lenses designed for astigmatism correction). This structural calibration apparatus is widely used in medical optics workshops and engineering laboratories to guarantee a delicate mounting and perfect centering of transparent components.