Reddit reviews Globe Scientific 139050 LDPE Extra Long Transfer Pipet, Non-Sterile, 300mm Length, 23.0mL Capacity (Box of 100)
We found 3 Reddit comments about Globe Scientific 139050 LDPE Extra Long Transfer Pipet, Non-Sterile, 300mm Length, 23.0mL Capacity (Box of 100). Here are the top ones, ranked by their Reddit score.
Non-toxic and chemically inert to biological fluids and most acids.Can be heat sealed to use for liquid storage or transport.Pipets can be frozen in liquid nitrogen.Produced from a custom grade of low-density polyethylene (LDPE) to make them non-slippery. This makes Globe Scientific pipets easy to grip with gloves.Custom packaging is available.
I ferment in glass carboys and use these 23 ml pipettes to take samples. They're plenty long to reach down to the fermenting wort.
Sean Terrill has probably the best linear polynomial calculation for accurately measuring post fermentation gravity with a refractometer.
FG = 1.0000 – 0.00085683*RI^i + 0.0034941*RI^f
Compared to the older simplified cubic, which is ironically more complex:
FG = 1.0000 – 0.0044993*RI^i + 0.011774*RI^f + 0.00027581*RI^i² – 0.0012717*RI^f² – 0.0000072800*RI^i³ + 0.000063293*RI^f³
http://seanterrill.com/2012/01/06/refractometer-calculator/
Yes, EtOH affects the refraction of light in beer. However, it affects it in a precisely predictable way. There is no reason to waste so much wort or beer just to get a gravity reading. You just need to understand the concepts and be willing to take careful measurements. A refractometer reading requires less than 1 mL. The small volume also makes getting your sample to the calibrated temperature for reading quicker.
My tips for accurate refractometer readings:
I always use one. I came from beer brewing and already had one, it makes life a whole lot easier and you lose a lot less mead in the process. You can get them for pretty cheap on Amazon too. I've seen them for as little as $20 before.
Add on some extra long pipettes if you use a glass carboy and your set.