It is a Simple Leaf
The numbers are leds instead of a needle
Make a significant difference. This would be referring to the needle of a measurement instrument; moving the needle would be really showing up on the measurement scale.
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Yes it is slightly painful, you do feel the needle pushing through and after you have soreness where the needle entered, it is about a 3/10 on the pain scale.
Yes - some Doctors don't numb the area at all.
yes it is
When reading the needle on an analog meter, you can get a slightly different reading depending on the position of your eye relative to the needle and the scale behind the needle. This is parallax. The digital meter reads the exact value measured (to the accuracy of the meter), and then displays it in the form of "numbers" or "digits" so your eye is not interpreting the value from a scale.
the mercalli scale uses roman numerals and measures how much damage there was in the earthquake. the richter scale uses a needle with ink and does sort of a line graph and measures the magnitude of an earthquake.
scale factor
The needle in a scanning tunneling microscope is typically on the nanometer scale, ranging from 1 to 10 nanometers in diameter. Its sharp tip allows for atomic-scale resolution during imaging by detecting the tunneling current between the tip and the surface being scanned.
The strip of mirror is mounted to help eliminate parallax errors when reading the value on the scale of the voltmeter. By aligning the needle's reflection with its actual position on the scale in the mirror, the observer can avoid viewing the needle from an angle, which could result in an inaccurate reading due to parallax. This setup ensures a more precise and accurate reading of the voltmeter.
Scale