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View Full Version : Conductivity meter or Refractometer


mhltcob
11/07/2006, 05:45 PM
For under $150 what device would you buy for calculating salinity? I was thinking about getting a pinpoint conductivity meter but is there something else out there that will give me more bang for my buck. Have the pinpoints proved dependable or do they need to be calibrated often? How often should the probes be replaced? If there is a thread that already answers this feel free to link it as the search function never works for me.

mhltcob
11/07/2006, 05:48 PM
I should also mention that the reason i'm leaning toward the monitor is because the refractometers i've always used never seemed to hold up to any abuse-the plastic "slide" always seems to break off.

bertoni
11/07/2006, 08:43 PM
I have been using the PinPoint salinity monitor, and like it. I'm not sure about the price, but I am sure it's under $200. I have had similar issues with refractometers, and don't use mine any more.

mhltcob
11/07/2006, 09:14 PM
Thanks for the help!

The pinpoint is $115. I have a pinpoint pH monitor and its worked out great but I have never actually talked to anyone who has used their salinity monitor.

Randy Holmes-Farley
11/08/2006, 06:20 AM
I personally like conductivity (salinity) meters. While I do not use the Pinpoint (but it is generally fine), it can also be used to measure limewater potency. From American Marine/Pinpoint they call it a salinity meter, with their conductivity meter having too low of a range (and is aimed at RO/DI).


This article may help:

Using Conductivity to Measure Salinity
http://www.aquariumfish.com/aquariumfish/detail.aspx?aid=1804

and

What is TDS?
http://www.reefkeeping.com/issues/2004-04/rhf/feature/index.php

and

Reef Aquarium Salinity: Homemade Calibration Standards
http://reefkeeping.com/issues/2004-06/rhf/index.htm

mhltcob
11/08/2006, 07:32 PM
Thanks Randy,

It looks like I will get the pinpoint. Lamottes looked very nice but was around 330$. Hach's started at about double that. Milwaukee I believe has one for under 100$ but I havnt had the best experiences with their products, plus it is an ugly lime green :)

Randy Holmes-Farley
11/09/2006, 10:19 AM
:thumbsup:

Let us know how it works out for you. :)