### device | instrument | optical instrument:

Spectrometer
* are best for doing detailed analysis of an object
  - the instruments that engineers build to detect the fingerprints
  - used in spectroscopic analysis to identify materials
* break light into component wavelengths.
* can operate as a reflectometer to study magnetic and superconducting thin films.
* divide light into different colours and wavelengths.
* measure the numbers and energies of particles or photons encountered.
* reports on transitions between the vibrational energy levels of molecules.
* require a detector and a device to analyze the signal.
+ Spectrometer, Spectroscopes: Physics :: Laboratory equipment
  * Spectrometers are used in spectroscopic analysis to identify materials. Spectroscopes are used often in astronomy and some branches of chemistry. Early spectroscopes were simply a prism with graduations marking wavelengths of light. Modern spectroscopes, such as monochromators, generally use a diffraction grating, a movable slit, and some kind of photodetector, all automated and controlled by a computer. The spectroscope was invented by Gustav Robert Georg Kirchhoff and Robert Wilhelm Bunsen.

### device | instrument | optical instrument:

Spectroscope
* are a very important tool used by astronomers
  - optical instruments
* is an optical instrument
* measure the light or radiation of an energy source.
+ Spectrometer, Spectroscopes: Physics :: Laboratory equipment
  * Spectrometers are used in spectroscopic analysis to identify materials. Spectroscopes are used often in astronomy and some branches of chemistry. Early spectroscopes were simply a prism with graduations marking wavelengths of light. Modern spectroscopes, such as monochromators, generally use a diffraction grating, a movable slit, and some kind of photodetector, all automated and controlled by a computer. The spectroscope was invented by Gustav Robert Georg Kirchhoff and Robert Wilhelm Bunsen.

Passive instrument
* detect natural energy that is reflected or emitted from the observed scene.
* measure the energy which is given off by the Earth.

Pedometer
* are activity meters which are attached to the leg of the cow.
* is an instrument

Periscope
* Most periscopes are part of submarines.
* includes lenses
  - sections
* is an optical instrument

Pipet
* deliver the most accurately measured volume of a liquid.
* is an instrument

Pipette
* are a useful way for transferring ephyrae and small jellies of any species
  - devices that allow the users to extract or deliver small amounts of a liquid
* tend to release bubbles of air that burst droplets of residual fluid.

Polygraph
- employed to verify, corroborate or refute statements
  - useful in determining whether a person viable suspect of a reported crime
* measures the body's normal responses.
* set of programs that simulate Web clients and servers.

Power of attorney
* Powers of attorney allow grandparents only to make decisions regarding the grandchildren.
* are legal documents
  - forms
  - the authority to act legally for another person

### device | instrument:

Probe
* are exploration
  - inquiries
  - located in dentists
  - research
* use radio waves to send information back to Earth or sometimes to a manned spacecraft.
+ Space probe: Spacecraft :: Machines
  * A 'space probe' is an unmanned space mission, usually a small spacecraft sent out to find out information about a planet or other far away thing. A planetary probe may land on the planet, or orbit around it, or merely fly by closely. Probes use radio waves to send information back to Earth or sometimes to a manned spacecraft.

### device | instrument | probe:

Molecular probe
* define different regions of the mouse t complex.
* detect a toxic algae.

Radioactive probe
* bind to specific fragments in a DNA sample such as a donor gene.
* is detected by autoradiography.