The VST LAB Coffee III Refractometer is a high-precision tool designed to measure Total Dissolved Solids (TDS) in coffee and espresso, helping professionals analyse brewing strength and extraction efficiency with scientific accuracy. Now in its fourth generation, this compact device fits comfortably in your hand while offering laboratory-grade performance. It delivers accuracy to ±0.02% with precision of ±0.1%, and even greater accuracy within specific ranges—±0.03% for filter coffee and ±0.05% for espresso. Automatic temperature compensation (15–40°C) ensures reliable readings in varying conditions. The advanced sapphire optics and 1024-element detector array provide rapid, stable results, averaging multiple readings and displaying a final TDS value in decimal format—easily converted to a percentage. Equipped with an auto-ranging TDS scale, it helps you explore the relationships between strength, flavour, and extraction, making it an invaluable tool for cafés, roasters, and competition-level brewing. The rugged design includes a stainless steel sample well, ambient light shield, evaporative cover, and a rubber-armour jacket for commercial durability. It also comes with VST CoffeeTools software (Windows/macOS) for calculating extraction yield and other key metrics. VST LAB Coffee III Refractometer FEATURES TDS Analysis – Discover the extraction yield of brewed coffee using Light Refraction. Sapphire Optics – With extreme surface hardness and scratch resistance. Multiple Measurements – Averaging out the TDS over several samples taken. Auto-Ranging – From Filtered Coffee to Espresso range of 0.00-20.00% Temperature Stable – Automatic Temperature Compensation provides accurate results regardless of surrounds. Smart Zero Set – Using distilled water ensures precision and accuracy of reading. Durable Cover – It will protect the Refractometer in harsh environments. This product includes: VST LAB Coffee III Refractometer The Specifics Coffee Espresso Coffee & Espresso Unit of Measurement % TDS Range 0.00 - 9.99 0.00 - 20.0 0.00 - 20.00 Resolution 0.01% 0.1% 0.1% Precision +/- 0.02% +/- 0.1% +/- 0.03% Accuracy +/- 0.05% +/- 0.1% 0.00 - 4.99 – +/- 0.05% 5.00-20.00% – +/- 0.10% Prism Material Sapphire Well Material Stainless Steel Detector 1024 Elements Temperature Range 15 to 40ºc Sample Volume 0.3ml Measuring Time 4,000 Readings Dimensions (mm) (L) 145 x (W) 75 x (D) 37 Weight 250g Note: Included software is available to gain access to further calculations of extraction yield and other results. The VST LAB Coffee III Refractometer only, measures % TDS.
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