Free shipping applies to all domestic orders. Orders are processed and shipped during regular business hours (Monday through Friday 8:00 am to 5:00 pm EST, excluding holidays).
Save an extra 20% off your entire order with coupon code: HOLIDAY20
*May exclude certain brands.
**May not be combined with any other offer.
Code expires 12/13/13
The Danner Supreme Hydrometer is an accurate, easy-to-use tester for determining the salinity and specific gravity of your saltwater aquarium water. Proper salinity is essential to maintaining the health of your aquarium fish - don't leave it up to chance!