Great Aquariums Start Here
1-800-566-3474
    Free Shipping On $175+
  • FREE Shipping On $175+
  • 14-Day Low Price Guarantee
  • 14-Day Low Price Guarantee
  • Same Day Shipping
  • Same Day Shipping
FREE Shipping on Orders Over $175
FREE Shipping on
Orders Over $175
Standard ground shipping (1-7 business days) starts at a low $5.99 and most orders over $175 ship FREE. Learn More
14-Day Low Price Guarantee
If you find a product we sell for a lower price at another online store, we will match their price—today and up to 14 days after you've purchased the item! Learn More
Same Day Shipping
Same Day Shipping
We promise to ship your order as fast as humanly possible. In fact, 99% of orders placed before 6 pm EST ship the same day! Learn More

Refractometers

Marine Depot Refractometer
The Marine Depot Refractometer is a must have for all hobbyists. The proper salinity is crucial for the survival and health of your fish and corals.

This high quality refractometer is extremely accurate and easy to use and calibrate. Calibration is simply done with a few drops of distilled water. This model also features ATC (automatic temperature compensation).
  • Adjustable eyepiece
  • Carrying case
  • Pipette
  • Calibration screw driver
  • Range for Testing: 0-28%
  • Division: 0.20%
Marine Depot Refractometer
Marine Depot Logo
Please click here to view larger image
Item #DescriptionPrice 
MD2101Marine Depot Aquarium Refractometer$49.99
MD2103Marine Depot Aquarium Pro Refractometer$64.99
Captive Purity Refractometer
The Captive Purity Refractometer is an incredibly accurate and easy to device that eliminates the confusion associated with inexpensive hydrometers. Just place a couple of drops of water on the prism and hold to the light. Reads in percent and specific gravity. An absolute must for the serious marine hobbyist.

Captive Purity Refractometer
The Captive Purity Refractometer is an optical device (no batteries) dual scaled 0-100% specific gravity: 1.0 to 1.070. Calibrate with distilled water. Adjustable eyepiece, carrying case, pipette and calibration screw driver included. *this model is ATC (automatic temperature compensating)*

Do not be fooled by the price. This is the same top of the line model unit that sells for $119 elsewhere. As you can see from the unaltered picture, this is not the flimsy unit selling for under $80 elsewhere.
Item #DescriptionPrice 
CP2111Captive Purity Refractometer$59.99
Captive Purity Refractometer with Calibration Dial
Captive Purity Refractometer with Calibration DialThis Captive Purity Refractometer has additional features including:
  • No Screwdriver Needed for Calibration
  • Heavy Duty Hinge Pin Design
Item #DescriptionPrice 
CP2113Captive Purity Refractometer with Calibration Dial$59.99
Captive Purity Refractometer with Light

Captive Purity Refractometer with LightThis Captive Purity Refractometer has its own lighting (three watch batteries included). No need to turn on the light in your room anymore.

Item #DescriptionPrice 
CP2115Captive Purity Refractometer with Light$75.99

This item is temporarily unavailable but will be back in stock soon.

Item #
Price:
Click the Add To Cart button below if you'd like to reserve this item today. Any other items included in your order will be immediately processed and shipped. We will ship this item separately as soon as it arrives. We will not charge you for this item until it ships and you will incur no additional shipping charges.

Enter your email address in the field below and click the Notify Me button if you'd like us to send you an email when this item becomes available. Although you will be immediately notified when we have stock on hand, we will not reserve any units for you; you must return to our website and place an order.

Your Email:
Just enter your email address below and we'll let you know when the product you are looking for becomes available!

Item Code:
Price:
Your Email:
Email Specials
Subscribe to our newsletter feed.
Newsletter Tips & Tricks! New Products!
Discounts & Promos!
Testimonials
Aug 18, 2014
"I like how easy it is to do business with Marine Depot. I also love the competitive prices on products."
Joshua

Aug 15, 2014
"The best online place to shop for all aquarium supplies. The best packing ever: I've ordered lights, nothing has ever broken."
Corals&Clowns

Aug 13, 2014
"Great place to buy reef aquarium products."
Gabe

Marine Depot Newsletter Signup
Aquariums, News & Culture
Join 100,000+ readers who receive weekly tips, videos, deals and giveaways.