[Nhcoll-l] Digital density meter vs refractometer

Tue Mar 21 17:20:44 EDT 2023

... or you invest a bit more (approx 90 Eur) in small calibrated densitometres -  see earlier post from 2021 ...

From: Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu><mailto:nhcoll-l-bounces at mailman.yale.edu> On Behalf Of Dirk Neumann
Sent: 19 March 2021 07:41
To: nhcoll-l at mailman.yale.edu<mailto:nhcoll-l at mailman.yale.edu>
Subject: Re: [Nhcoll-l] Hydrometer for spirit collection

why not using a small, customised alcoholmetre? We have a set of small, approximately 5 cm high alcoholmetres you can easily plunge into jars. They are user friendly, have no electronic parts, do not need to be charged, are very stable against chemical corrosion, and low cost (70 EUR).

All the best
Dirk

[cid:part1.znpsB978.LBWTFrw0 at leibniz-lib.de]

Am 21.03.2023 um 22:14 schrieb Callomon,Paul:
I'd also point to the good old Traille glass densitometers - the bigger ones are pretty accurate, though you need enough fluid for them to float in. The little "pocket" ones are less precise, but are cheap and do not go out of calibration.

Paul Callomon
Collection Manager, Malacology and General Invertebrates
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From: Nhcoll-l <nhcoll-l-bounces at mailman.yale.edu><mailto:nhcoll-l-bounces at mailman.yale.edu> on behalf of Bentley, Andrew Charles <abentley at ku.edu><mailto:abentley at ku.edu>
Sent: Tuesday, March 21, 2023 5:11 PM
To: nhcoll-l at mailman.yale.edu<mailto:nhcoll-l at mailman.yale.edu> <nhcoll-l at mailman.yale.edu><mailto:nhcoll-l at mailman.yale.edu>
Subject: [Nhcoll-l] Digital density meter vs refractometer

External.

After receiving an enquiry from someone about cheap alternatives to expensive digital density meters, I purchased a refractometer from Amazon for $22  (https://www.amazon.com/dp/B018LSMI34<https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.amazon.com%2Fdp%2FB018LSMI34&data=05%7C01%7Cprc44%40drexel.edu%7Cb87a66f4bdba443f856808db2a50e0e6%7C3664e6fa47bd45a696708c4f080f8ca6%7C0%7C0%7C638150299084791886%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=CijD0jCBSRBmMJsPoEiSY%2Bw9XytR%2BXqlsYcrB%2BOR0CU%3D&reserved=0>).  I did a number of tests against 70%, 50% and 30% and various concentrations in between measured with our $3,000 Anton Paar DMA 35 digital density meter.  The refractometer is not super accurate but is probably within 2-3% once calibrated.  I first calibrated against distilled water using the method in the instructions but found that it was reading a little high and so then calibrated against a known 70% concentration and then it was reading a little more accurately.  Take home I think is that if you are not too concerned about super accurate readings and just want to get in the ballpark it is a viable, cheap (can’t beat $22) alternative to a digital density meter.

Just an FYI for those working with wet collections who may be working with restrictive budgets.

Andy

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Stiftung Leibniz-Institut zur Analyse des Biodiversitätswandels
Postanschrift: Adenauerallee 127, 53113 Bonn, Germany

Stiftung des öffentlichen Rechts;
Generaldirektion: Prof. Dr. Bernhard Misof (Generaldirektor), Adrian Grüter (Kaufm. Geschäftsführer)
Sitz der Stiftung: Adenauerallee 160 in Bonn
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