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I played around with this a fair bit and it was great fun putting numbers to the brews.As I got the 0-10% range one for higher resolution it wont work for espresso but works well for v60, aeropress etc.  
Small stepping stone in understanding extraction. It's not a highly advanced tool. 

Optical Brix Refractometer Range 0-10% Brix 

Measuring Range: 0 to 10 %Bx
Division: 0.1 %Bx
Accuracy: ±0.1 %Bx
Reference Temperature: 20°C
ATC range: 10 - 30°C
Item Length: 20.5cm
Item weight: 109g
Shipping size: 21 x 9 x 6cm

The refractometer can be used to calculate approximate TDS and EY in coffee by following this:  

1) Weigh out the ground coffee to be used to gold cup standard
2) Brew coffee
3) Take Brix reading
4) Multiply Brix reading by 0.85 to get TDS as a percentage
5) Multiply %TDS by mass of liquid to work out mass of solids extracted
6) Divide mass of solids extracted by mass of ground coffee used to get extraction percentage
7) Plot TDS vs % extraction

Yours for £12 posted via PayPal friends & family

Will include a good few pipettes



LR - EK43S; Ceado E37S; Aergrind; Comandante MK3 - Syphon & V60 - patience

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