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Typically by measuring something of a known value. For example, you can test if a scale has been calibrated by weighing a nickel and verifying the scale reads 5g.
The usual device is called a clamp meter, a device that clamps round one wire to mesure the current via the magnetic field.
Be careful; they will probably not check whether you have any critical need, such as a life support device, and simply cut the energy off.
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You have to match the right voltage and the right polarity and also may sure that the transformer can produce enough power for the device. If the pin fits in the device, you have the right voltage. Now check the polarity. There will be a small diagram on the device and on the transfomer. Make sure they match. It's showing you which is "hot" and which one is ground. Finally, check to make sure the transformer can supply enough power i.e. 7W, 25W, 100W...whatever.
amplifier
The only way to check whether a tool has been calibrated is to review a calibration record, certificate or label to confirm that the most recent successful calibration was done recently enough. To check that a tool is IN calibration, use it to measure an item where the characteristic being measured is already known with high precision and confidence (called a standard). If the measurement result is close enough to the known value, then the tool is in calibration. Sometimes you might want to confirm or check the calibration by checking several standards with widely varying sizes or amounts.
to check the sensitivity of the instrument
To check external interference of light
because some detection device that feeds your car's computer is sending a bad signal. to find out which one, see your friendly mechanic.
I found a very credible government website with all kinds of information about calibration, and different things that can be calibrated. You can check it out by going here www.nist.gov/calibrations/.
One thing you can do is to ask for a Certificate of Authenticity. This will help to verify that the apparel is authentic.
A scale calibration weight allows a person to check that a set of scales are reading the correct figures. This works by placing a calibration weight of which its exact weight is knows and checking that the scale reads the same weight. If not, then the scales will need to be calibrated.
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An ammeter should not be used as a voltmeter. An ammeter is a low impedance device that measures the current going through a circuit, often by measuring the small voltage across a known resistance. A voltmeter is a high impedance device that measures the voltage across a circuit. If you were to connect an ammeter as if it were a voltmeter, you would effectively short out the circuit, drastically affecting its operation, and potentially damaging both the circuit and the ammeter.
Holmium oxide is used as standard reference to check wavelengts.
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