It's pretty common for hydrometers to be inaccurate. So it might even be higher than 1.030
Something like this would be better.
http://www.marinedepot.com/Marine_Depot_Aquarium_Refractometer_Refractometers_for_Saltwater_Aquariums-Marine_Depot-MD2101-FITEOPRF-vi.html
Don't use distilled water to calibrate. BAR has free calibration liquid you can have.
Something like this would be better.
http://www.marinedepot.com/Marine_Depot_Aquarium_Refractometer_Refractometers_for_Saltwater_Aquariums-Marine_Depot-MD2101-FITEOPRF-vi.html
Don't use distilled water to calibrate. BAR has free calibration liquid you can have.