Five 25g coffee bags arranged together, one of each caffeine level: 0, 25, 50, 75, and 100

Calibration Kit

£31.99
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Five 25g coffee bags arranged together, one of each caffeine level: 0, 25, 50, 75, and 100
Specialty grade
Swiss Water decaf
Roasted to order
5 caffeine levels

Calibration Kit

£31.99
How do I brew it? Exact recipes for pour over, French press, and espresso.

Each 25g bag gives you two clean tests at 12g per brew. Pick one method and stick with it all week. Same recipe, different level each day.

Pour over

12g coffee, 200ml water at 92-96°C. Medium-fine grind. Bloom 30s, pour in circles. About 3 minutes total. Two brews per bag.

French press

25g (one full bag), 400ml water at 92-96°C. Coarse grind. Steep 4 minutes, press slowly. One brew per bag.

Your 7-Day Calibration Protocol (in the bonus PDFs) has the full tasting plan: when to test each level, how to judge it, and what to reorder.

Read the full brew guide →

When will it arrive? Tracked Royal Mail, 2-3 working days. Free over £30.
  • Free UK shipping on orders over £30
  • Standard UK delivery: £3.99 (orders under £30)
  • Dispatched within 48 hours of roasting
  • Delivered via Royal Mail (2-3 business days)
  • Order tracking provided via email
What if it's not for me? 14-day no-questions refund or replacement.
  • 14-day freshness guarantee - not happy? Let us know
  • Contact us within 14 days of delivery for any quality issues
  • Full refund or replacement, no questions asked
  • Get in touch within 14 days

Read the refund policy

How do I keep it fresh? Cool, dark, sealed. Best within 4 weeks of opening.
  • Store in a cool, dark place away from direct sunlight
  • Keep the bag sealed between uses
  • Best consumed within 4 weeks of opening
  • Whole beans stay fresh longer than pre-ground
  • Avoid refrigeration - moisture is coffee's enemy

How to find your level.

  1. Step 1

    Brew the bags

    Brew one bag a day for five days, using the same recipe each time.

  2. Step 2

    Note how you feel

    Track energy, focus, and sleep for each level.

  3. Step 3

    Reorder the level that worked

    Order the level that fit your mornings. Pick a second one for afternoons if you want.

What's in the kit.

  • Five 25g bags Approx. caffeine per 10g brew
    0~0 mg
    25~25 mg
    50~50 mg
    75~75 mg
    100~100 mg
  • Three digital guides Delivered to your inbox at checkout.
    7-Day Calibration Protocol preview
    PDF · Week plan

    7-Day Calibration Protocol

    What to try each day, how to judge it, and what the results mean.

    Caffeine Timing Guide preview
    PDF · Field guide

    Caffeine Timing Guide

    How late each level is safe to drink if you want to sleep.

    Find Your Level Journal preview
    PDF · Worksheet

    Find Your Level Journal

    A simple log to match each cup to how you felt.

  • Full refund if none fit If all five miss, the kit has failed at its one job. We refund it.

Why this kit exists.

I went ten years without coffee after tracing my insomnia to caffeine. Tried everything: matcha, cacao, chicory. None of it was coffee.

When Swiss Water decaf got good, I started blending it with regular beans at exact ratios and found my sweet spot around 25. Turns out a lot of people have the same problem. The Calibration Kit is what I wished existed a decade ago.

Read the full story

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