3 ms·

One for each . In the colon?

• HCIdivision17 10y ago
  Almost certainly this. In one of the links by another commenter here, you can see a voltmeter where the guy changes the decimal. The dots are bizarrely high to be a decimal point, but right where you'd expect it if it's the bottom dot on the colon.
  • Symbiote 10y ago
    I didn't find that video, but several of these seem to be British made. The decimal point in British use was traditionally centred: 3·141. (I still write it like that, in handwriting.)