My kent hydrometer

[millerphilip19pm]

My kent hydrometer was bought like a couple of days ago and it told me to leave it in saltwater for 24 hr so i let it sit in my tank to tune the needle but after that it has moved even after I refilled it. I have ten gallon Nano tank. I had two salt bags for 5 gallons each, I only put a bag and a half of the salt in (since the whole ten gallons isn't water) so, would it be likely that it's too little salt or the hydrometer?

 

[AdamNC]

Hydrometers are only ok at best, they get you in the ballpark. Get yourself a refractometer from BRS, cost a bit more but way more accurate. Or if you have the funds a Red Sea or Milwaukee one.