TDS Refractometer for Coffee R2 Extract, Range 0-30%, Accuracy ±0.02%, Portable, Water Resistant, Rechargeable, Ideal for Drip Coffee, Espresso and Coffee Enthusiasts

Great tool, quick use. Contrary to other mentions I never have to recalibrate - I used distilled water and my water, both same result and stability. My only complaint is that my measurements fluctuate when my sample is cooling down. I do like the little spoon it does help to mix and take a proper sample and cool it a little.

The R2 Extract Coffee TDS Refractometer is quite precise, user-friendly tool for serious coffee enthusiasts. With a 0–30% range and ±0.02% precision, it provides accurate readings for espresso, pour-over, and other brews. Its compact, waterproof design and rechargeable battery make it convenient for both home and café use. The interface is straightforward, and readings are quick and reliable—perfect for dialing in recipes or tracking brew consistency. It's a valuable tool for anyone wanting to better understand extraction and improve cup quality. A great investment for those who take their coffee seriously. Its quite an investment and it could have a more durable construction although it feels sturdy. A durable hard storage case to preotect it would be a plus over the soft case.

Imma go 5 stars for. 1. Great product works as described. Integrates with their scale perfectly. 2. Easy to set up. Really gets your coffee game up to speed for a better cup in no time. Learn how grind size can make a huge difference.. Customer service is Top notch. I had issues with their scale. Got me in the right direction ASAP Because of this I bought the R2. No regrets... Buy it it's a great piece of gear.. Works for espresso as well.. Enter the numbers the amount of coffee you brewed. The weight of the cup .. it does all the work It would be nice if they had a chart on how to dial in sour or bitter coffee. But easy enough to get the info on the web. Kudos

The unit does power on and does give a result however, the result is nothing close to what the documentations says it should be. You can’t trust the results.

My brother is a serious coffee connoisseur (nickname given by us, not a real professional lol), the kind who travels with half his brewing tools but still complains about the equipment he cannot bring. Every time he stays at my place or the family vacation home, he mentions something that is missing from his ideal setup. So I thought this would be a perfect gift for him to keep at the vacation house, where he wants to build a second little coffee station for everyone who enjoys a good cup. I am the black sheep who drinks whatever is available, but the rest of my family is coffee lover as much as he is. This set has worked out really well so far. The refractometer reads consistently, the precision feels accurate, and the scale responds quickly with a stable readout. The built-in timer makes pour-over brewing much easier for him, and the app has been surprisingly smooth for tracking TDS and dialing in consistency. He said it gives him all the basic control he needs without dragging extra equipment around. Well, he seems happy with it, and for someone who is this particular about coffee, that says a lot. I think this makes a great gift and has been a solid addition to our vacation home coffee station. In short, I think this was a worthy acquisition in terms of overall quality vs price.