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

RS Extract

Professional Coffee TDS Refractometer

Preorders shipping now

Preorders ship first

The first run sold out and is on its way to preorder holders now. Order today and yours ships with the next run on 8 November.

Choose a setup RS Extract On its own $549 $639Save $90.00 Brew Control System RS RS Extract· Microbalance Ti $679 $789Save $109.99 Sensory Brew Control System RS RS Extract· Microbalance Ti· Moment $889 $1,019Save $129.98 Sensory Brew Control System Ultimate RS RS Extract· Microbalance Ti· Moment· Omni $1,699 $1,919Save $219.97
$549.00$639.00Early bird−14%

Early-bird price until 5 November, 11:59 pm Pacific.

Own R1 Extract or R2 Extract? Owners pay as little as $479.00. Get your code before you buy.

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Loyalty discount · until 5 November

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
$479.00$639.00−25%
$90 early bird + $70 loyalty
DiFluid Coffee counts as R1 Extract
R2 Extract owners
$509.00$639.00−20%
$90 early bird + $40 loyalty

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

  1. Tick your deviceTick R1 Extract or R2 Extract on the loyalty page.
  2. Get your codeYour code shows straight away.
  3. Enter it at checkoutAdd RS Extract or an RS kit to your cart and enter the code at checkout.
Get your code before you order, so it's ready at checkout.
Get your code 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

Shipping since 25 October 2026. Preorders are on their way. Orders placed now ship with the next run on 8 November.