Know your TDS!

There's a certain satisfaction in knowing your coffee is doing exactly what you think it is. Not guessing. Not approximating. Knowing. The Difluid R2 Extract is built for that kind of certainty.

What the R2 Does

The R2 Extract measures total dissolved solids (TDS) in your brew — quickly, accurately, and without the fuss of traditional refractometers. Pair it with CoffeeOS and it goes further: logging your brews automatically, calculating extraction yield in real time, and mapping results directly onto the Brew Control Chart. The data you've always wanted, finally in a format that actually helps you act on it.

Why the R2 is Different

Most refractometers are delicate instruments built around a small sensor vulnerable to ambient light — requiring a lid, careful handling, and a fair amount of patience. The R2 Extract takes a different approach. Its larger CMOS sensor dramatically reduces the influence of external light, making it more accurate, more durable, and lid-free by design. It connects via Bluetooth and lives inside your workflow, not outside of it.

Built for Every Brew - from pourover to expresso

With a TDS range of 0–30%, the R2 Extract handles everything from a delicate filter to a concentrated espresso shot. For espresso, a quick filter before measuring keeps oils from interfering — though even unfiltered, the oversized sensor produces results that are notably more accurate than what you'd expect from conventional tools.

Calibration is equally straightforward: use distilled water for absolute comparability across setups, or your actual brew water for the most precise extraction calculations.

Who is the R2 For

Whether you're dialing in at a café, developing a new roast, or simply trying to brew the same great cup twice — the R2 Extract gives you the feedback loop to make it happen. Repeatable results aren't an accident. They're a practice.

What kind of water should I use to calibrate?

For calibrating your R2 TDS meter, use distilled or RO water to set the calibration to zero.

For understanding your brew TDS, also measure your water TDS to compare. To dial in your water, we recommend using our Apax Lab Mineral Concentrates. 

APP Enabled

Pairs with CoffeeOS. Works with filter and espresso. Bluetooth connected.

APAX LABS x SLOW POUR SUPPLY JAMM [2] 

Richness - Sweetness - Mouthfeel

Apax Lab has joint forces with Slow Pour Supply to bring you the limited edition JAMM [2] in 20ml!

This special JAMM [2] release has been formulated to enhance the richness and depth of your coffee and will accentuate the lingering sweetness and creamy mouthfeel of your brew. It magnifies the role of calcium and bicarbonate.

How to use:

Brew Water:

You can simply apply 3 to 4g/L of mineral concentrate in your distilled or RO water to yield a controlled mineralized water. 

Post Brew: Add directly 1 to 10 drops into your coffee. We recommend to try gradually, and swirl thoroughly to let the minerals evenly dissolved into the brew. Taste and adjust according to preference.

Shake the bottle thoroughly before use. 

More about the Apax Lab minerals

The Apax Lab mineral concentrates are made of demineralized water and analytical reagent grade minerals (AR), ensuring very high levels of purity.

Taste profile: rich | sweet | creamy.

Composition: water, magnesium chloride, calcium chloride, potassium chloride, potassium bicarbonate, sodium bicarbonate.

Bottle size: 20mL for approximately 30 brews 

Signs your coffee may need JAMM [2]: a lack of sweetness, thin mouthfeel, and overpowering acidity or bitterness.

Please refer to this user guide for formulating water for your brew recipes!

This Product Ships for Free

A Perfect Gift for Better Brewing

Elevate every cup with this beautifully packaged APAX AB Minerals Set – featuring all three of our signature mineral concentrates in 100ml bottles. Designed for the discerning coffee brewer, this set makes an ideal addition for anyone looking to unlock the full potential of their brews through water chemistry.

Each mineral formulation is crafted to enhance different flavor profiles and extraction characteristics, giving brewers the tools to fine-tune their water for espresso, filter, or experimental brews.

Whether for a home barista, a competition-level brewer, or the coffee nerd in your life – this set brings science, precision, and better coffee to every kitchen. 

Click the link below to download standard recipes to follow along!

Inside the box set:

1. Tonik [1]-100ml
2. Jamm [2] - 100ml
3. Lylac [3] - 100ml

CLICK FOR ENHANCER WORKFLOW CHART

CLICK FOR RECIPE

APAX LABS TONIK [1] 

Has been formulated to enhance the vibrant acidity of your coffee and will impart a crisp, intense and juicy kick to your brew.

The mineral concentrates are made of demineralized water and analytical reagent grade minerals (AR), ensuring very high levels of purity.

Taste profile: vibrant | bright | juicy.

Composition: water, magnesium chloride, calcium chloride, sodium chloride, sodium bicarbonate, potassium bicarbonate.

Bottle size: 20mL for approximately 30 brews. 100mL for approximately 150 brews.

How to use: Shake the bottle thoroughly before use. Add 3 to 4g/L of mineral concentrate in your brew water, or add directly 1 to 10 drops into your coffee.

TONIK [1]

Composition: water, magnesium chloride, calcium chloride, sodium chloride, sodium bicarbonate, potassium bicarbonate.

TONIK [1] has been formulated to enhance the vibrant acidity of your coffee and will impart a crisp, intense and juicy kick to your brew.

Taste profile: vibrant | bright | juicy.

Please refer to this user guide for formulating water for your brew recipes!

APAX LAB JAMM [2]

JAMM [2] has been formulated to enhance the richness and depth of your coffee and will accentuate the lingering sweetness and creamy mouthfeel of your brew. It magnifies the role of calcium and bicarbonate.

Our mineral concentrates are made of demineralized water and analytical reagent grade minerals (AR), ensuring very high levels of purity.

Taste profile: rich | sweet | creamy.

Composition: water, magnesium chloride, calcium chloride, potassium chloride, potassium bicarbonate, sodium bicarbonate.

Bottle size: 100mL for approximately 150 brews 

How to use: Shake the bottle thoroughly before use. Add 3 to 4g/L of mineral concentrate in your brew water, or add directly 1 to 10 drops into your coffee.

Signs your coffee may need JAMM [2]: a lack of sweetness, thin mouthfeel, and overpowering acidity or bitterness.

Please refer to this user guide for formulating water for your brew recipes!

A Perfect Gift for Better Brewing

Elevate your brewing experience with this beautifully packaged APAX AB Minerals Set – featuring all three of our signature mineral concentrates in 20ml bottles. Designed for the discerning coffee brewer, this set makes an ideal addition for anyone looking to unlock the full potential of their brews through water chemistry.

Each mineral formulation is crafted to enhance different flavor profiles and extraction characteristics, giving brewers the tools to fine-tune their water for espresso, filter, or experimental brews.

Whether for a home barista, a competition-level brewer, or the coffee nerd in your life – this set brings science, precision, and better coffee to every kitchen. 

Click the link below to download standard recipes to follow along!

Inside the box set:

1. Tonik [1]-20ml
2. Jamm [2] - 20ml
3. Lylac [3] - 20ml

CLICK FOR ENHANCER WORKFLOW CHART

CLICK FOR RECIPE

APAX LAB LYLAC [3]

LYLAC [3] harnesses the qualities of sulfate and potassium to underscore the delicate and floral characteristics of your coffee, ensuring an elegant, refined, and graceful addition to your brew with a silky mouthfeel.

Our mineral concentrates are made of demineralized water and analytical reagent grade minerals (AR), ensuring very high levels of purity.

Taste profile: elegant | floral | silky.

Composition: water, magnesium sulfate, magnesium chloride, potassium chloride, potassium bicarbonate, sodium bicarbonate, sodium chloride.

Bottle size: 100mL for approximately 150 brews 

How to use: Shake the bottle thoroughly before use. Add 3 to 4g/L of mineral concentrate in your brew water, or add directly 1 to 10 drops into your coffee.

Signs your coffee may need LYLAC [3]: a lack of smoothness and roundness, an aftertaste that is too harsh, a lack of floral and citrus notes.

Please refer to this user guide for formulating water for your brew recipes!

A water chemistry starter kit for the brewer who wants to see how far three different minerals can take a cup

Every brew starts with water, and water is never just water. It carries minerals that shape how coffee extracts, how sweetness comes forward, and how a cup finishes. Most brewers never touch that variable, not because it doesn't matter, but because the tools to work with it usually feel like they belong in a lab, not a kitchen.

This starter kit is built for finding that out. It pairs the Apax Lab Water Mineral Concentrates, Nano Box Set, three concentrates named Tonik, Jamm, and Lylac, with an Apax Lab TDS Meter Pen, so you can measure your water, then try each mineral against the same beans and see what changes.

Water Customization Made Easy

Water chemistry has quietly become one of the more interesting frontiers in home brewing. Total dissolved solids, the minerals suspended in your water, influence how thoroughly coffee extracts and which flavors come through most clearly. Two brewers using the same beans, the same grinder, and the same recipe can land in different cups if their water differs.

Built for Exploration

The Nano Box Set is not a single fixed recipe. It holds three separate directions, made so you can taste the range rather than commit to one answer. Tonik, Jamm, and Lylac each push a cup somewhere different, and having all three on hand means a side-by-side comparison is only a few drops away. Brew the same coffee three ways, once with each concentrate, and the differences show up in the cup rather than on a spec sheet.

Why Water Chemistry Matters

The Apax Lab TDS Meter Pen measures conductivity, giving you a fast reading of your water's total dissolved solids before you start. That reading is your baseline, the fixed point you compare against as you test each of the three minerals from the Nano Box Set. Used together, the meter and the concentrates turn water into something you can actually investigate, one adjustment and one cup at a time.

Product Details

The Setup

The kit is built around a simple loop: measure, then explore. Start with the Apax Lab TDS Meter Pen to read your water's baseline. From there, add drops from the Nano Box Set, Tonik, Jamm, or Lylac, to shift your water and compare what each one does to the same brew. A use guide walks through starting ratios for each concentrate, and a downloadable recipe guide is included for brewers who want a proven starting point before branching out on their own.

What's in the Box

• Apax Lab Water Mineral Concentrates, Nano Box Set: Tonik, Jamm, and Lylac, 20ml each
• Apax Lab TDS Meter Pen: One meter for measuring total dissolved solids
• Use guide: Starting ratios and instructions for all three concentrates, plus access to a downloadable recipe guide

CLICK FOR ENHANCER WORKFLOW CHART

CLICK FOR RECIPE

APAX LABS x SLOW POUR SUPPLY KONFLUX [K] Special Edition

Unlock Depth, Texture, and Indulgence - coming to you at San Diego World of Coffee 

Apax Lab has joint forces with Slow Pour Supply to bring you the limited edition KONFLUX [K] in 20ml!

KONFLUX [K] is formulated to enhance mouthfeel, depth, and sweetness, bringing a rich, coating texture and a sense of harmony to your brews. With just a few drops, KONFLUX transforms the tactile experience of coffee, making cups feel rounder, smoother, and more indulgent without masking flavour.

Originally created as a limited-edition profile for the 2025 World Brewers Cup, KONFLUX quickly proved itself on the world stage. Since then, it has gone on to support winning routines at the Australian national level and the World AeroPress Championship, earning its place as a trusted, competition-grade profile.

Designed for moments when every element needs to come together, KONFLUX embodies its name. It is the point where sweetness, balance, and texture converge.

What KONFLUX brings to the cup

• Enhances mouthfeel and perceived depth
  
  

• Elevates sweetness while maintaining balance
  
  

• Creates a smooth, round, coating texture
  
  

• Adds indulgence without sacrificing clarity
  
  

Who it’s for

• Baristas, competitors, and cafés seeking richer tactile expression
  
  

• Coffees that feel clean and expressive, yet lack body or intensity
  
  

• Brewers pursuing sweetness, balance, and a luxurious mouthfeel
  
  

Available formats

• 20 mL (≈30 brews)
  
  

• 100 mL (≈150 brews)
  
  

Bring championship-level texture and indulgence to your coffee, with just a few drops of KONFLUX.

Created in collaboration with Nemo Pop, this limited-edition mineral concentrate replicates the exact water profile used during his world-winning routine. Designed to deliver a sweet, structured and velvety cup, this profile enhances mouthfeel while maintaining clarity and controlled acidity.

Developed during months of preparation and refinement, this recipe became the foundation of Nemo’s winning approach: a cup that feels round, balanced and expressive from the first sip to the finish.

What This Profile Brings

• Heavy, round mouthfeel
• Enhanced sweetness and balance
• Clear flavour definition
• Smooth, controlled acidity

The result is a cup profile that feels rich, sweet and structured, while still allowing the coffee’s origin character to shine.