Paper filter for use with refractometer

[Birrofilo]

@jrgtr42

Actually one of the reasons why I bought a digital refractometer rather than an analogic one is that the digital refractometer has its own light source. An analogue refractometer is dependent on the light source you use. I had read that they are precise only with solar light. More probably, they can work well also with artificial light provided that the calibration is made in that light conditions.

If I had to buy a refractometer now I would buy an analogue one as I see that it is ultimately more practical.

 

[moorejl57]

I would imagine that evaporation plays a big role in a changing reading over time if you have a very thin layer. There are some fairly cheap non sterile syringe filters on amazon that you could try.

 

[Birrofilo]

I used the coffee paper filters yesterday for the first time, and I have to say that, after judicious waiting for temperature equalization, the sample gave readings within 0,1°B and actually agreeing with the hydrometer. I actually filtered the beer twice through the same filter, because it was decently fast.

I will go with the coffee filters until I consume them, which will take a lot. If I encounter problems down the road, I will examine more sophisticated solutions. For the moment, the humble and cheap paper coffee filter is OK. Thanks to all for the help and for having reconciled me with my refractometer (which is not humble and not cheap).