RS Extract | Professional Coffee TDS RefractometerRS Extract in its boxRS Extract box

RS Extract

Professional Coffee TDS Refractometer

Choose a setup RS Extract On its own KM 1.138,11Save KM 90,00 Brew Control System RS RS Extract· Microbalance Ti KM 1.405,27Save KM 109,98 Sensory Brew Control System RS RS Extract· Microbalance Ti· Moment KM 1.814,92Save KM 129,96 Sensory Brew Control System Ultimate RS RS Extract· Microbalance Ti· Moment· Omni KM 3.417,90Save KM 219,94
KM 1.138,11Early bird−14%

Early-bird price until 25 October, 11:59 pm Pacific.

Own R1 Extract or R2 Extract? Owners pay as little as . Apply before you buy.

Ships from 25 October in the order received, starting with preorders.

Learn moreExperience it

ShippingReturnsWarranty

Loyalty discount · until 25 October

Own R1 or R2 Extract?

Thank you for measuring with us. Owners take an extra discount on RS Extract and every RS kit, on top of the early-bird price.

R1 Extract owners
KM 978,11KM 1.138,11−25%
KM 90 early bird + KM 70 loyalty
DiFluid Coffee counts as R1 Extract
R2 Extract owners
KM 1.008,11KM 1.138,11−20%
KM 90 early bird + KM 40 loyalty

One code per owner, used once. Own both? You get the R1 price.

  1. ApplyHave your order number ready, or a photo of your receipt and of your device.
  2. Get your code by emailWithin 2 working days.
  3. Log in, then check outUse the email you applied with and enter the code at checkout.
Apply before you order, so your code is ready at checkout.
Apply for the loyalty discount How it works

What it does

Reads coffee hot, from 4 to 65 °C. RS Extract is a professional coffee refractometer for people whose measurements other people rely on: roasteries, training labs, quality teams, competitors and field service. Pour the sample straight from the brew and read it. Cooling Curve Compensation uses the room temperature and the temperature in the well to work out where the reading settles, so there is no pipette rinse, no waiting for the sample to cool, and no evaporation creeping into the result.

  • ±0.02% TDS repeatability, on a refractive index resolved to 0.00002
  • 0 to 30% TDS, so filter and espresso are measured on one device
  • Extraction yield on the device: enter dose and beverage weight on the 3.5-inch color touchscreen and read EXT% beside TDS on the brew control chart
  • 500 stored readings
  • A magnetic lid seals the well while it reads, and doubles as the dust cap
  • IP67, 13 hours of continuous measuring, USB-C charging
  • Connects to CoffeeOS over Bluetooth, so each reading can be linked to the brew and the bean it came from

Preorder. Shipping starts 25 October 2026. Orders ship in the order they were placed.