Quality Testing #2 Fuel

[MADVAN]

I test every tank of fuel with Kent-More #J34352-3 Hydrometer.
Is this still a valid test with the new Fuel?
My testing have been showing gas/diesel mix.
Seeing if i have to change fuel station or Hydrometer.

BILL

 

[BJS]

Hydrometers do not go bad over time unless you break them. However the new fuel will have a specific gravity that is different from the LSD that you were used to testing.