{"type":"firestarter.listing","listing":{"id":"lst_eCVY0p8a","product_name":"Difluid R2 Extract TDS Meter","category":"Accessories","description":"Know your TDS!\nThere'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.\nWhat the R2 Does\nThe 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.\nWhy the R2 is Different\nMost 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.\nBuilt for Every Brew - from pourover to expresso\nWith 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.\nCalibration is equally straightforward: use distilled water for absolute comparability across setups, or your actual brew water for the most precise extraction calculations.\nWho is the R2 For\nWhether 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.\n\nWhat kind of water should I use to calibrate?\nFor calibrating your R2 TDS meter, use distilled or RO wate","images":["https://cdn.shopify.com/s/files/1/0275/3567/1361/files/DifluidR2-4.png?v=1777237689","https://cdn.shopify.com/s/files/1/0275/3567/1361/files/DifluidR2-2.png?v=1777237689","https://cdn.shopify.com/s/files/1/0275/3567/1361/files/DifluidR2-3.png?v=1777237689","https://cdn.shopify.com/s/files/1/0275/3567/1361/files/DifluidR2-5.png?v=1777237689","https://cdn.shopify.com/s/files/1/0275/3567/1361/files/DifluidR2-6.png?v=1777237689","https://cdn.shopify.com/s/files/1/0275/3567/1361/files/DifluidR2-7.png?v=1777237689","https://cdn.shopify.com/s/files/1/0275/3567/1361/files/DifluidR2-8.png?v=1777237689","https://cdn.shopify.com/s/files/1/0275/3567/1361/files/DifluidR2.png?v=1777237689"],"price":229,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-18T20:44:25.379Z"},"share_url":"https://firestarter.network/l/lst_eCVY0p8a","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer <your Firestarter API key>","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_eCVY0p8a' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Difluid R2 Extract TDS Meter' and a budget_max comfortably above $229.00 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}