Refractometer

Bryan · #1 01-02-2003, 05:18 AM

Anybody using a refractometer, if so how do you like it. Curious as to the resolution/divisions on the scale.

From what I have been able to find most have 1 ppt or 0.001 Specific Gravity. From this scale can you distinguish if your sample is 1.0250 vs 1.0255 if it only has a division of .001.

Aquattro · #2 01-02-2003, 05:56 AM

Better question is where to buy these at a good price??

ron101 · #3 01-02-2003, 06:18 AM

Ordered mine from Saltwater Connections; Milwaukee autotemp for $119. The increments for SG are .001 but since it is analog you can tell when it is in between though not necessarily to a .0005 accuracy.

I'm partial to the refractometer concept over a digital meter since the latter has issues with probe life.

zulu_principle · #4 01-03-2003, 03:54 AM

I have both the pinpoint and a refractometer (purchased on ebay) used.

I still like the standard sg container for $9.99 and every once in a while check it with the refractometer.

As for the pinpoint it needs to be calibrated often and it has been sent back twice to pinpoint.

Wendell

Bryan · #5 01-03-2003, 05:01 AM

I have been having problems with my Pinpoint salinity as well. I do have a quality Tropic Marine floating hydrometer which is supposed to be very accurate which I can use to calibrate one of the cheap plastic floating types..

Quote:

Originally Posted by zulu_principle

As for the pinpoint it needs to be calibrated often and it has been sent back twice to pinpoint.

Wendell

EmilyB · #6 01-03-2003, 05:38 AM

I purchased my refractometer from northcoastmarines (shipped via mail). I see they have the new ones with the stronger pins.....

I only use it to make sure the SeaTest is working mostly, or when I want a really precise measurement.

It is important to note that not all hydrometers are temp corrected. (The SeaTest is)

http://www.northcoastmarines.com/REFRACT.htm

Aquattro · #7 01-03-2003, 06:03 AM

Quote:

Originally Posted by zulu_principle

I have both the pinpoint and a refractometer (purchased on ebay) used.

I still like the standard sg container for $9.99 and every once in a while check it with the refractometer.

Wendell

Wedell is calibrating hydrometers at the meeting!!!!! wohoo!!

8)