Electronic data recorders for measuring, storing and monitoring a variety of physical parameters, such as, air temperature, relative humidity, AC/DC current and voltage, differential pressure, time-of-use, light intensity, water temperature, water level, dissolved oxygen, soil moisture, rainfall, wind speed and direction, leaf wetness, and pulse signals

'ac/dc':20 'air':16 'current':21 'data':2 'differenti':24 'direct':44 'dissolv':36 'electron':1 'humid':19 'intens':31 'leaf':45 'level':35 'light':30 'measur':5 'moistur':39 'monitor':8 'oxygen':37 'paramet':13 'physic':12 'pressur':25 'puls':48 'rainfal':40 'record':3 'relat':18 'signal':49 'soil':38 'speed':42 'store':6 'temperatur':17,33 'time':27 'time-of-us':26 'use':29 'varieti':10 'voltag':23 'water':32,34 'wet':46 'wind':41

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