09
Interface devices consisting of analog and digital ports,
internal memory, built-in programs for graphing calculators,
used with external and internal components to collect,
analyze, and graph measurements of temperature, barometric
pressure, magnetic fields, ph levels, flow rate,
acceleration, gas pressure, force, dissolved oxygen,
electrode amplification, chloride ion, ammonium ion, calcium
ion, nitrate ion, oxidization and reduction, oxygen gas,
light, ultraviolet light, voltage, current, conductivity,
electronic charge, humidity, soil moisture,
electrocardiograph level, sound level, voltage
amplification, salinity, turbidity, grip strength, air flow,
lung volume, respiration, heart rate, and other scientific
data, which can be connected to a computer, graphing
calculator, or personal digital assistant, or used as a
stand-alone device, for use in elementary school, junior
high school, high school, and college science and math
laboratories and classrooms
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