Refractometers, are they all the same.

Refractometers, are they all the same.

Postby William » Thu Dec 01, 2011 7:50 pm

A few weeks ago I dropped my Vital Sine refractomter in the aquarium and it has not worked well since so I went looking for a replacement.

I had many times been frustrated by how close together the lines are and wished the scale was not so wide range. When I read the description of the Marine Depot "Aquarium Pro" model, I was sold. Especially considering it was $80 cheaper.

http://www.marinedepot.com/Marine_Depot ... RF-vi.html
Easier to Read
One of the other problems with most Refractometers is the scale displayed normally reads from 0-100ppt when we are really only interested in the region from 30-40ppt The Reef Meter Refractometer has therefore been specifically designed to read from 0 1.020-1.040 which gives you 2.5 times the resolution of a normal 0-100 scale.
Almost all hand held salt water refractometers available to the hobby.


So it arrived and tried it out. What a disappointment. The scale really only shows the 1.020 - 1.040 range. But their claim that the scale is in any way magnified is completely bogus.

The picture below I took photographs looking though the refractometers and placed the photographs next to each other. The cyan horizontal lines show that the scales match each other identically (I was actually surprised how perfectly the two pictures lined up).

RefractometerComparison.jpg


Does anyone actually think that masking part 2/3 of the scale makes a refractometer it easier to read? Are there any refractometers out there which actually do have a magnified scale?


Should I make a stink about the misleading description and return the marine depot refractometer?
You do not have the required permissions to view the files attached to this post.
Will
User avatar
William
 
Posts: 2178
Joined: Fri Jun 29, 2007 11:19 am

Re: Refractometers, are they all the same.

Postby spawner » Fri Dec 02, 2011 1:00 am

There is one made in Japan that is really great, all the rest mostly stink, cheap imports. Your Vital is an ok one but I'd rather have a conductivity meter any-day. If you don't want a conductivity meter then get a plastic hydrometer, they are as good as the cheap imported refractometer. So RETURN IT.

Here is the good one: http://www.atago.net/english/products_hsr.php
User avatar
spawner
 
Posts: 1610
Joined: Mon Mar 05, 2007 8:28 am

Re: Refractometers, are they all the same.

Postby jeff@zina.com » Fri Dec 02, 2011 10:58 am

Floating glass hydrometers are cheap and accurate as well. Mine is a rather inexpensive version with the same scale.

Jeff
User avatar
jeff@zina.com
 
Posts: 714
Joined: Sun Apr 19, 2009 10:16 am
Location: Naples, Florida USA

Re: Refractometers, are they all the same.

Postby EasterEggs » Fri Dec 02, 2011 11:47 am

I'm not aware of any magnified scales, but I would definitely return that hydrometer to Marine Depot. That description is very misleading.

spawner wrote:If you don't want a conductivity meter then get a plastic hydrometer, they are as good as the cheap imported refractometer.


Yikes! I have two float arm hydrometers. One is out by 0.006, the other 0.008. I think a cheap imported refractometer would be more accurate than that! Calibration fluids are pretty easy to use. ;)
Given sufficient thrust, pigs will fly just fine.
EasterEggs
 
Posts: 544
Joined: Tue Apr 26, 2011 1:33 pm
Location: Canada

Re: Refractometers, are they all the same.

Postby Luis A M » Fri Dec 02, 2011 12:33 pm

Sometimes we need all the rank.1.000 for calibration with distilled water or find out if we put FW by mistake somewhere.And I prepare SW at 1.040 and also need to check the salinity of BS cultures,above 1.050 :wink:
Luis
User avatar
Luis A M
Moderator
 
Posts: 5630
Joined: Sun Mar 04, 2007 2:34 pm
Location: Buenos Aires,Argentina

Re: Refractometers, are they all the same.

Postby Suzy » Fri Dec 02, 2011 1:03 pm

The only thing with using the float arm noes is sharing them between tanks, IMO. With the refractometer, I can have a sryinge for each tank and I dont have to bleach equipment in between them as much.
www.Suzysreef.com
User avatar
Suzy
Read-Only
 
Posts: 2190
Joined: Sun Dec 20, 2009 6:54 pm

Re: Refractometers, are they all the same.

Postby DanUnderwood » Sat Dec 03, 2011 8:50 am

I have to agree on the cheap refractometers. We borrowed a YSI meter from a lab and tested it against our refractometers and were shocked at how far off they were.

Dan
Dan Underwood
Seahorse Source, Inc.
User avatar
DanUnderwood
 
Posts: 151
Joined: Thu Jun 07, 2007 3:21 pm
Location: Fort Pierce, FL

Re: Refractometers, are they all the same.

Postby EasterEggs » Sat Dec 03, 2011 12:38 pm

Ok then, I have a Link brand refractometer which I think was over $100 (I've had it for years). Is this a "cheap" one or a decent one?
Given sufficient thrust, pigs will fly just fine.
EasterEggs
 
Posts: 544
Joined: Tue Apr 26, 2011 1:33 pm
Location: Canada


Return to General Aquarium Husbandry



Who is online

Users browsing this forum: No registered users and 2 guests