What is the range of time scale?

What is the range of a pH scale?

What is the range of ph scale

What is the range of nano scale.

Mention the range of time scales.

The scales of an ammeter and a voltmeter are shown below: What is the range of the ammeter and the range of the voltmeter?

pK_(w)=12.26 at 100^(@)C . What is the range of pH-scale at this temperature? What will be the pH of a neutral solution at this temperature ?

What is the range of astronomical time scales to microscopic scale?