#meter

• Astigmometer — An optical precision apparatus or instrument used in ophthalmology and optometry to measure the degree and axes of ocular astigmatism, evaluating the curvature irregularities of the anterior surface of the cornea.
• Astrophotometer — A high-precision astronomical instrument (equipped with photoelectric sensors or calibrated CCD/CMOS cells) used in astrophotometry to quantitatively measure the luminous flux, intensity, and brightness of radiation emitted by celestial bodies. This device allows comparing the magnitude of a target star with a standard artificial light source or reference stars, forming the basis for calculating light curves of variable stars and detecting extrasolar planets.
• Astrometer — An astronomical measuring instrument used for the precise determination of angular positions, coordinates, and distances between celestial bodies in the night sky. Although historically the term defined filar micrometers or classic meridian circles used in astrometry, it can currently also designate the human specialists operating these complex mapping systems or automated scanning telescopes linked to sensor arrays.
• Audiometric — Belonging to audiometry, relating to audiometry, or to the acoustic measurement of hearing sensitivity and acuity; performed using an audiometer. The term describes tests, equipment, laboratories, or soundproof booths specially designed to evaluate the minimum threshold of sound perception across various frequencies.
• Audiometry — A clinical method of measuring hearing acuity and sensitivity using a device called an audiometer, by determining the perception threshold of sounds at various frequencies and intensities. The procedure enables professionals to diagnose the type, degree, and anatomical location of hearing loss.
• Audiometer — An electroacoustic high-precision device used in medicine and audiology to measure hearing acuity and determine the threshold of sound perception. The apparatus generates reference sound signals with strictly controlled frequencies and intensities transmitted via specialized headphones, allowing the practitioner to map out hearing loss.
• Self-isotherm — A self-isotherm; a curve or graphical representation within a thermodynamic coordinate system showing the variation of state parameters of a body or physical system that maintains a constant temperature through its own internal regulation or energy compensation mechanisms, without guided external thermal input. In physico-chemical processes, the line describes autonomous thermal equilibrium phenomena occurring in closed or structurally isolated systems.
• Autorefractor — A computerized medical device used in ophthalmology and optometry for the automatic and objective measurement of eye refractive errors, such as myopia, hyperopia, or astigmatism. This device analyzes how light is reflected off the retina, providing the specialist with a highly accurate baseline value for the subsequent prescription of eyeglasses or contact lenses.
• Auxanograph — A technical apparatus or instrument for the automatic and continuous recording, on a chart or digital media, of the growth curve of plants or microorganism cultures over time; a combined device that measures and graphically plots organic dimensional variations.
• Auxanometer — A laboratory instrument or apparatus used for the precise measurement and dynamic tracking of the elongation rate of a plant's stem or organs, operating through the mechanical, optical, or digital amplification of the micrometric movements of growing plant tissues.
• Auxometer — A special optical instrument or apparatus used to determine and measure the magnifying power of a lens system, microscope, or telescope; a precision device engineered to measure the exit pupil diameter or the ratio between image size and actual object size.
• Avometer — A portable measuring instrument, analog or digital, utilized in electrical engineering and electronics to determine the numerical values of the main electrical quantities within a structural circuit. Its name is an acronym formed from the fundamental measurement units it records: Amperes (current intensity), Volts (electrical voltage), and Ohms (electrical resistance); multimeter.
• 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.
• Azotometer — A laboratory apparatus used for the quantitative determination of the volume of nitrogen released from a chemical reaction, or for measuring the concentration of nitrogenous compounds within a complex substance (such as soil or fertilizers); it typically operates on eudiometric or volumetric principles.
• Azotometer — A laboratory apparatus or precision instrument used for the quantitative determination of the volume of nitrogen released during a chemical reaction or organic decomposition process. This structural device, typically made of borosilicate glass and equipped with a graduated scale, is essential in volumetric elemental analyses for measuring the purity of gaseous compounds.