y level Definition

gravity meter, dynameter, astrometer, backstaff, tellurometer, macrometer, magnetograph, statoscope, haemoscope, chorograph, pseudoscope, range pole, terrestrial telescope, forestaff, holometer, cathetometer, pantometer, dioptometer, dynactinometer, anglemeter, teinoscope, phonometer, thermoscope, phantascope, horologiography, vibroscope, heliometer, anemography, perspectograph, mesolabe, absolute space, angulometer, spectrohelioscope, datum plane, stauroscope, stereometer, telescopy, anomaloscope, spherograph, noematachograph, demicircle, rhysimeter, acoumeter, apparent magnitude, alethoscope, pilot balloon, chartometer, sideroscope, wheatstone bridge, phakoscope, tasimeter, vaporimeter, orthoscope, perspicil, vacuum gauge, pyrheliometer, object glass, hygrostatics, volumescope, nephoscope, rheotrope, chromascope, absolute magnitude, cosmolabe, phenakistoscope, echometer, scotoscope, declinator, planometry, spirit level, lucimeter, lactoscope, anemograph, cephalometry, vibrograph, ephemeris time, system of measurement, light meter, machmeter, cephalometer, coelostat, exposure meter, almucantar, leucoscope, hydrodynamometer, sciagraph, eidograph, operameter, point of reference, stethograph, scalogram, hydrophore, microtasimeter, instrument, aerometer, optigraph, micronometer, rydberg constant, pachymeter, temperature scale,