Computer hardware comprised of sensors, namely, accelerometers, gas sensors, colorimeter, conductivity probes, current and voltage probes, dissolved oxygen probes, force sensors, EKG sensors, exercise heart-rate monitors, temperature probes, flow rate sensors, gas pressure sensors, instrumentation amplifiers, ammonium ion-selective electrodes, calcium ion-selective electrodes, chloride ion-selective electrodes, nitrate ion-selective electrodes, light sensors, magnetic field sensors, microphones, motion detectors, ph-level sensors, radiation monitors, relative humidity sensors, respiration monitor belts, rotary motion sensors, student radiation monitor, turbidity sensors, thermocouplers, voltage probes, water depth sampler, and related computer interface boards for use in junior high school and high school science classrooms