What is a piezometer.?
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piezometer uses the piezoelectric electric effect.\nIf you compress a piece of quartz it produces a voltage.\nThis voltage is measured and displayed on a desired scale.\n\nUsually used to measure fluid pressure, so the voltmeter has a pressure scale printed on it.
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From Wikipedia:\n"An attenuator is an electronic device that reduces the amplitude or power of a signal without appreciably distorting its waveform. Attenuators are usually passive devices made from resistors. The degree of attenuation may be fixed, continuously adjustable, or incrementally adjustable.\n\nFixed electrical attenuators are often called pads, especially in telephony. The input and output impedances of an electrical attenuator are usually matched to the impedances of the signal source and load, respectively."
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In what context are you asking this question? Vibro-meter is a brand name of a company that manufactures a variety of test equipment.  There are many uses of a meter to measure electric potential.
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In general, the basis of a sensor is to measure some physical property (sound intensity, temperature, light intensity, position, velocity, acceleration, to name a few) and produce an electrical output that represents the amplitude of the property. There are sensors that don't output an electrical signal but indicate amplitude in some other way such as position. An example would be a mechanical speed governor. But the majority of sensors have an electrical output since we are able to do any needed amount of processing of such a signal.\nMicrophones and motion detectors are examples of acoustic sensors. Microphones generate an electric signal that is an analog of the sound it receives; i.e., the signal shows all the vibrations that make up the sound. This can be amplified and used to drive loudspeakers, recording equipment, etc. (If used to detect motion, this would be called "passive" detection.) Acoustic motion sensors use "active" detection. A very high-frequency loudspeaker sends out an ultrasonic sound signal, which results in a particular signal being reflected from nearby surfaces and returned to a microphone. With nothing in the sound field moving, the microphone receives the same sound frequency as is transmitted and a constant amplitude. A moving object reflects some of the sound back to the microphone at a slightly different frequency (due to the Doppler effect) and with slightly different amplitude due to the changing interference pattern created by the motion. Depending on the type of detector, the frequency and/or amplitude change triggers a detection signal, which then can be used to energize an alarm, open a door, turn on a light, etc.
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Tachymeters measure speed. You time how long it took you to run a certain distance or do some given task and that is how fast you did it.
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A Piezo sensor is basically a quartz crystal.  When the crystal is subjected to stress or shock, it generates an electric voltage.  This is called the Piezoelectric effect. \nThe sensors are then connected to measuring and recording equipment that monitors the sensor for the output of any voltages from the crystal.\n\n\nPiezo sensors are placed in specialized mechanical strain gauges that can detect very minute movements...and thus can detect movement within the surface of the Earth.
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Manometers are used to measure pressure. It's basically a u-shaped tube with a liquid in the bottom (usually water or mercury) and it is sealed on one end. As the pressure increases, the liquid is pushed up into the sealed end. By graduating the tube, you can use it to measure presure.
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A Psychrometer is the general name for instruments designed to determine the moisture content of air. A psychrometer consists of dry-and wet-bulb thermometers that give the Dry-and Wet-bulb Temperatures, which in turn are used to determine Relative Humidity and Dew Point.
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A sonometer wire is a (usually steel) wire used in a sonometer. A sonometer is used to study transverse vibrations in a string. Bridges can be used to change the length of the string, which runs over a pully to a set of weights which are used to change the tension.
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got a dandy.....even though  it  seems  difficult   youll  break through  and  find  out  you can  almost  measure  anything....try  this  because  i dont  know  what  type  of  equipment  you have....in  search  bar  go.....vernier  read .. hit search..the  NTNU site java  is  excellentyou you can  even  practice  measuring  on  line.....reading  a  vernier  is  good too.....check  them  all
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An indoor rower is also known as an ergometer (slang ergo or erg). An ergometer being a device which measures the amount of energy or work performed. The indoor rower is calibrated to measure the amount of energy the rower is generating. Ergometer comes from the Greek word's ergon, meaning work and metron, meaning measure. An ergometer therefore is a device that literally means "work measurer".
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Not real sure of the concept behind this as I have never worked on one. I assume it use a Wheel of some sort that spin with the amount of Volume. Electronic Meters could use a type of sensor that can meter the Volume by different electronic methods such as Ultraviolet light. I will look around and see what Info I can find. This is a good question you ask, that I have never really had a need to ask, now I am curious.\nYea, it depend on the type of application as to the type and function of the meter. Very much to learn here. There are Ultrasonic Meter, Venturi, Magnetic etc. it Awesome. But, the Basic function is to control/meter the amount of whatever you transferring for different reasons.
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Smart Sensors or Intelligent Sensors are sensors that incorporate a microprocessor or microcontroller. They usually compensate for environmental disturbances and have built int ADC's and comunications systems by digital buses. \n\nGoogle Intelligent Sensors
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A device for passing measured amount of gas or compressed air under constant pressure through gas meters to test accuracy of meters.\n\nkindly check below websites also :)
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Oxygen Sensor - an electronic device that measures the proportion of oxygen in the gas.
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the correct instrument for relative humidity is a hygrometer. a humidifier humidifies the air. a thermometer measures the temperature. a barometer measures the relative air pressure.
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Since no-one else has answered the question yet, I'll take a stab at it -\n\nI think the term you're looking for is Hysteresis