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 it is
Yes - some Doctors don't numb the area at all.
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-like leaves and scale-like leaves help the coniferous trees by conserving water loss with the wax coating. The also give the tree more surface area for photosynthesis.
Scale
a value scale is a simple drawing tool that can help you see and draw values correctly.