Coffee enthusiasts and cafe operators who rely on precise measurements to dial in their brews now have a more convenient option. A new professional refractometer called the RS Extract has just launched in the United States, promising to simplify how baristas and technicians measure the strength and consistency of brewed coffee without tedious temperature adjustments.
What the RS Extract Does
The RS Extract is a refractometer designed to measure total dissolved solids, or TDS, in coffee. TDS readings tell you how much coffee material has dissolved into water during brewing, which directly affects flavor strength and quality. Launched at the 2026 Roast Summit in Portland, Oregon, this Chinese-made device carries a retail price of $639 and began shipping in late October.
What sets the RS Extract apart from existing models is its ability to handle a much wider range of sample temperatures. The device can work with coffee samples anywhere from 39.2 degrees Fahrenheit up to 149 degrees Fahrenheit, eliminating the need to cool hot coffee or warm cold brew before testing. For busy cafe environments, this expanded temperature range means faster, more streamlined workflows.
How Temperature Affects Measurement Accuracy
Temperature has always been a critical factor in measuring TDS accurately. As liquid heats up, molecular expansion creates the perception of lower TDS, so precise measurement requires software compensation. DiFluid’s previous R2 Extract model required samples to stay within a narrow 68 to 104 degree Fahrenheit range, forcing operators to modify their samples before testing.
The new model uses what the company calls Cooling Curve Compensation technology. This system relies on a temperature sensor positioned directly at the sample well and the device’s metal construction to calculate a stabilized reading while limiting light exposure and evaporation. The result is faster, more accurate measurements across a broader spectrum of real world brewing conditions.
Real World Applications for Coffee Shops and Beyond
The RS Extract’s practical appeal extends far beyond specialty coffee bars. Technicians who service super automatic espresso machines at gas stations, car dealerships, and corporate offices can now verify that equipment is producing quality coffee objectively, rather than relying on subjective taste evaluation or staff training. This is especially valuable in locations where staff may lack coffee knowledge but need to maintain consistent quality standards.
The device also connects directly to DiFluid brewing scales to display live brew data on its 3.5 inch color touchscreen. During brewing, operators see weight, flow rate, and timing information. After brewing is complete, the TDS measurement and all brewing data combine into a single digital record that syncs with DiFluid’s CoffeeOS app. This integration keeps cafe staff focused on service rather than juggling multiple screens and devices.
Design and Portability Considerations
While larger and heavier than DiFluid’s portable handheld meters, the RS Extract remains portable enough for competition use and field service applications. The sturdy metal construction contributes to its durability and temperature-stabilization performance. Whether you operate the best drip coffee makers at home or manage a high volume cafe bar, precision measurement tools like this are increasingly accessible.
Market Context and Competitive Landscape
The RS Extract enters a relatively small but growing market for coffee specific refractometers. Competitors include Japanese instrument maker Atago, which has sold coffee refractometers since opening its U.S. office in 2002, and VST Inc., which developed its first coffee specific refractometer in 2008. DiFluid, founded in Shenzhen, China in 2021, has rapidly expanded its portfolio to cover analysis at every stage of the coffee supply chain, from green beans to brewed coffee in the cup.
The company plans to continue selling its smaller and more affordable R2 Extract model for those who need basic TDS measurement without the advanced temperature range. DiFluid also hints at upcoming improvements to ground coffee particle analysis tools, signaling ongoing innovation.
What This Means for Coffee Shoppers
For consumers, the RS Extract’s launch reflects broader industry trends toward data driven quality control. Whether you brew single serve coffee makers at home or purchase coffee from a local shop, you benefit when equipment is precisely calibrated and verified. Cafes that invest in measurement tools tend to maintain more consistent flavor profiles and brewing quality over time.
The expanded temperature range also means cafe operators spend less time fussing with samples and more time perfecting their actual brewing process. That efficiency translates to fresher, better tasting coffee served to you faster. As measurement technology becomes more practical and affordable, expect to see quality assurance data playing a larger role in how cafes market and justify their pricing.
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