Can you get good repeatability from that inexpensive refractometer? How about for a filter coffee where the TDS is lower? Can it measure with usable accuracy?
Hey so can I use 0.25mm needles instead of 0.35mm because it's hard to find 0.35mm in my place. The 0.25mm is the only option available here so are those any good..?? ( For Picopresso only ) your reply and help much appreciated. Thank you..🙏
Great video! Is it necessary to use distilled water to calibrate, considering that one doesn't make coffee with distilled water. Shouldn't calibration be done with the same water that one mixes the solution with?
@@jkimmakes This metal piece that you use instead of the plastic door on the refractometer. Can you explain the benefits? Does it have a name. I have tried to contact renegadeguru.
@@NebbieLoon I'm the one who makes these 👋 (I'll answer your Discord message too) It's nicknamed the "magic mushroom", mostly because of the shape. The 'shroom's purpose is to rapidly cool a sample and prevent evaporation, because temperature has a large impact on refractive index and therefore on TDS reading. While not necessarily quite as accurate as cooling each sample in a carefully cleaned separate closed container, it's much faster/more convenient, and far more accurate and consistent than dropping a hot sample into the refractometer.
Hey coffee machinest thanks for the response! Are familiar with this specific refractometer that jkim is using? Is it accurate enough for general coffee nerd purposes?
@@Andrew-wp1bz Just saw this - yes, the yellow refractometer (sold under a number of different chinese-based brands, on Amazon/ebay/Ali, colloquially the "yellowboi") is one of the cheapest available refractometers with enough accuracy and precision to use with filter coffee. Make sure you get one intended for coffee, as coffee has a different TDS:refractive index curve than sugar (brix)/alcohol/saline. It's a little more finicky than an Atago or VST, but with careful use it can produce good results
omg why not use the actual tablet image in your video? nice fingers, can I borrow them? But I appreciate you explaining the concept. I'm diabetic, was looking for reviews and comparisons. Evidently pricy is not better.
