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Captive Purity Refractometer with Calibration Dial

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CP2113

This item has been discontinued.

Captive Purity

The Captive Purity Refractometer is an incredibly accurate and easy to use 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.

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 included. This model is ATC (automatic temperature compensating).

This Captive Purity Refractometer has additional features including:

  • No Screwdriver Needed for Calibration
  • Heavy Duty Hinge Pin Design




Specifications

  • No Screwdriver Needed for Calibration
  • Heavy Duty Hinge Pin Design


Manufacturer Info

Captive Purity manufactures water filtration and water testing supplies for marine and reef aquaria. The brand is best known for their high-quality line of reverse osmosis filter systems and accessories. Captive Purity also produces refractometers for testing salinity, portable pen-sized meters for testing pH as well as replacement filter media for their RO and RO/DI filter systems.


Warranty

12 Month manufacturer warranty.

65 Reviews

BRIAN WAGGLE from ZANESVILLE, OH UNITED STATES

03/25/2013

Experience Level: Beginner

Refract

Great product. It's my first refractometer, and the light makes it really easy to read.

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KENNETH M FAGIN from Gaithersburg, MD UNITED STATES

09/06/2012

Experience Level: Expert

Poor Quality

I just got this. My old refractometer was much, much more solidly built (and cost more, $159, about ten or twelve years ago when I got it) but eventually got corroded out of useability due to saltwater drips over the years.I bought the one with the built-in light. That is where the primary defect lies. There is a barrel assembly above the prism that houses three button-cell batteries and a small LED peeking out over the prism. The LED will not stay lit. There seems to be a "sweet spot" where, when the cap to close the battery compartment and a collar around the push-button switch on the opposite end are arranged "just so," the light will come on when you push the switch. But then as soon as you push the switch to turn off the light, things seem to get misaligned again and light won't come back on. Maybe that is a "one-off" problem, but construction just feels "cheap," which may be cause of the problem.Also, the way the prism cover plate is connected to the end of the unit is odd. It uses a pin-in-slot arrangement (i.e., a lost-motion sort of connection) insteat of a pin-in-hole pivot arrangement, with two "ears" or "tabs" hanging down at a right angle to the cover plate and the mounting slots being located in those "ears." If the plate isn't moved so that the pins are located clearly at the ends of the slots before trying to close the cover, it would be very easy to break off the tabs or ears.Bottom line: I'm calling customer service next to get RMA to send this back for other refractometer.

2 out of 2 found this review helpful

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DOELL MESEY from LOMA LINDA, CA UNITED STATES

08/14/2012

Experience Level: Intermediate

Great Product!

Great product, easy to use and operate. I bought this because I have a 5 gallon nano aquarium(and a 75 gallon)and checking the salinity with a traditional swing arm Hydrometer was a ROYAL PAIN! Plus I didn't really trust the readings I was getting in the Hydrometer because you never know if you have all of the bubbles out. I love having the lighted version of this refractometer. I use reading glasses so I would imagine that if I had gotten the one without the light it would have been much harder to read. That being said, it is still a little difficult to count the exact lines (for salinity) but I can easily get a good idea of my salinity within a couple of seconds. My only bit of advice is before each use, wipe the glass and the cover with a lint-free cloth and after each use, wipe the glass and the cover with a paper towel first and then with a soft lint free cloth after. If there is any residue on the glass or the cover the reading will be off, even with RO or Distilled water.So don't keep recalibrating it, just make sure the surface is clean and lint free. All-in-all, this product works great and has saved me many headaches!

1 out of 1 found this review helpful

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HSING YU LIANG from DIAMOND, CA UNITED STATES

03/03/2012

Experience Level: Expert

Unreliable

Very unreliable, I have had to calibrate it every time when I use it. >"<

0 out of 2 found this review helpful

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RAY H from AURORA, CO UNITED STATES

01/30/2012

Experience Level: Expert

Does a Great Job!!!

This refractometer is very accurate and works great but the light is not very bright and is only really useful if you’re trying to read it in the dark. I would say it's a nice feature to have if you've got the money but not really worth the extra cost for a tighter budget.

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QUANG HUYNH from FAIRFAX, VA UNITED STATES

01/18/2012

Experience Level: Beginner

An excellent device

It's a well built instrument that you need to have for all marine aquarists. It's easy to use. Very important that it is stored at the same temperature and the temperature of the room when you do the initial calibration has to be the same with the temperature when you do your measurement. My Instant Ocean Hydrometer gives the same reading as this device. I however prefer the refractometer since you don't have worry about the bubbles that stick to the lever, filling the hydrometer with tank water and cleaning it after use each time to prevent minerals from being deposited on the lever which will eventually give you false readings. The cost of the refractometer is really affordable compared to other things you have already spent on this hobby.

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MARCUS NEUMANN from CYPRESS, CA UNITED STATES

01/07/2012

Experience Level: Intermediate

Great refractometer

Great tool and is a must have. The light works great. Very accurate and easy to use. Thanks Marine Depot!

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JEFFREY OLIPHANT from PHOENIX, AZ UNITED STATES

12/01/2011

Experience Level: Intermediate

Very Satisfied

I highly recommend this device. I'm very happy I purchased the lighted model. It has a focus on the view lense and stores nicely in the case provided. Very satisifed with my purchase.

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LEONARD THOME from PORT NECHES, TX UNITED STATES

11/26/2011

Experience Level: Intermediate

Excellent!

This device works flawlessly. Easy to calibrate and the added light makes viewing the results easy and without effort. I had one before that did not have a light and I must say that having a built in light makes all the difference. This is the refractometer to have, in my opinion.

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CHRIS YOUNG from BLAWNOX, PA UNITED STATES

11/17/2011

Experience Level: Intermediate

Excellent tool

I don't know how I lived without a refractometer before. This item is well made and very accurate! Gone are the days of a swing-arm hydrometer. This is well worth the $$ and pays for itself in spades.

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