Example image of eyePlorer eyePlorer map for 'Measuring instrument': Engineering Measurement Object (philosophy) Phenomenon Physical quantity Physical science Quality assurance Units of measurement Test method Instrument error Measurement uncertainty Physicist Electron microscope Particle accelerator Stopwatch Virtual instrumentation Time travel Electrical work Orders of magnitude (time) Pumped-storage hydroelectricity Time Timeline of time measurement technology Work (physics) Energy carrier Electric potential energy Energy form Energy transformation Mechanical energy Potential Orders of magnitude (energy) Orders of magnitude (power) Angular momentum Phototube Planck constant Photoelectric effect Classical mechanics Continuum mechanics Distance measuring equipment Doppler effect Doppler radar Echo sounding Eudiometer Flow measurement Global Positioning System Laser rangefinder LIDAR Measuring cup Orders of magnitude (area) Orders of magnitude (length) Pneumatic trough