1.009 is correct, however you really shouldn't use a swing arm hydrometer to test with. they are not acurate enough. you really need a refractometer. If you don't have one, borrow one or take water to the lfs so they can test it. If you use the one in the pic and it is off just a touch you could go through the entire hypo treatment, be at 1.010 or 1.011 and it won't kill the ich. you can find the refractometers online for about $69.00.