great product By bill c on 5/17/11
bill c would recommend this product to a friend
this thing is seriously accurate. i had some major issues going on with my tank and i knew something was off. well i checked this against my tank and my salinity was seriously low. so much that when i adjusted it i had to readjust all my livestock. i wouldnt run 35ppt exactly as this thing will have it dead on and surely what you were using isnt this accurate.
now my tank is on its way to recovery.