bars and tone on a uv meter that register zero
(the first red line on a betacam uv-1800 deck)
Read as -20 on a digital betacam.
Everything thats ever come in here from New York to Hollywood has been this way.
Though occasionally we get odd tones that are not anywhere close to being helpful in which case I set things manually, not to exceed -10 on average with an absolute ceiling of -6.
my 002 cents