Reddit 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.

Industrial & Scientific
Lab & Scientific Products
Lab Instruments & Equipment
Lab Pipettes
Transfer Pipettes
Lab Fluid & Liquid Handling
Globe Scientific 139050 LDPE Extra Long Transfer Pipet, Non-Sterile, 300mm Length, 23.0mL Capacity (Box of 100)
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.
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3 Reddit comments about Globe Scientific 139050 LDPE Extra Long Transfer Pipet, Non-Sterile, 300mm Length, 23.0mL Capacity (Box of 100):

u/Guazzabuglio · 2 pointsr/Homebrewing

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.

u/ScottyDelicious · 2 pointsr/Homebrewing

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:

  • Calibrate with distilled water EVERY TIME you take a reading.
  • Keep your refractometer in a temp controlled area. I take all my readings in my basement work room, which is always at 68°F.
  • Get some 300mm pipettes. These are awesome for pulling a few mL from a carboy. I sanitize these with star san and pull a sample right through the air lock hole in the bung.
  • Put your 1-2 mL sample next to your refractometer for about 10 minutes before reading to allow the temperature to match your calibration water.
  • Calibrate, calibrate, take a reading from your sample, calibrate, take another reading from the sample. I do this until I am consistently getting the same reading. The glass can shift, especially if your solutions are different temperatures.
  • Use Sean Terrill's refractometer calculator. Most online calculators use only a simplified cubic equation and don't account for a wort correction factor.
u/Fett2 · 2 pointsr/mead

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.