{"product_id":"vst-syringe-filters","title":"VST Syringe Filters for Espresso \u0026 Coffee Refractometry","description":"\u003ch1\u003e\u003cstrong\u003eVST Syringe Filters for Espresso \u0026amp; Coffee Refractometry\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cp\u003eVST Syringe Filters are an essential accessory for anyone using a refractometer to measure espresso extraction. Freshly brewed espresso contains two things that compromise refractometer accuracy: fine suspended solids that reflect light rather than refracting it, producing erratic readings, and dissolved CO2 that actively reduces the refractive index of your sample, causing TDS readings to come in lower than the true value. VST engineered these multi-media filters to tackle both problems simultaneously - clarifying the sample and allowing trapped CO2 to escape - so your measurements meet VST's own ±0.01% precision specification.\u003c\/p\u003e\n\u003cp\u003eWhile designed with espresso in mind, they're equally useful for filter coffee brewed through perforated metal or woven mesh filters such as the AeroPress with a metal disc or reusable pour-over filters. Particularly valuable for benchmarking and troubleshooting filter basket performance across single, double, and triple baskets, or comparing consistency across multiple machines. Pairs directly with the \u003ca title=\"VST LAB Coffee III Refractometer\" href=\"https:\/\/ozonecoffee.mom\/products\/vst-lab-coffee-iii-refractometer\"\u003eVST LAB Coffee III Refractometer\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003eAvailable in a 50-filter pack (no syringes included, suited to those who already own compatible Luer-Lok syringes) or a 100-filter pack (includes five syringes to get you started).\u003c\/p\u003e\n\u003ch1\u003e\u003cstrong\u003eTechnical specifications\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter type:\u003c\/strong\u003e Multi-media syringe filter for clarification and degassing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDeveloped by:\u003c\/strong\u003e VST (Voice Systems Technology, Inc.)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrimary use:\u003c\/strong\u003e Removing suspended solids and CO2 from espresso for refractometer measurement\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision maintained:\u003c\/strong\u003e ±0.01% typical precision when used with VST refractometers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible beverages:\u003c\/strong\u003e Espresso, filter coffee brewed with metal or mesh filters\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack sizes:\u003c\/strong\u003e 50 filters (no syringes) or 100 filters (5 syringes included)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSyringe compatibility:\u003c\/strong\u003e Luer-Lok tip syringes (10ml recommended)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle use:\u003c\/strong\u003e Each filter is designed for one-time use\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStorage:\u003c\/strong\u003e Cool, dry place away from direct sunlight\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch1\u003e\u003cstrong\u003eFrequently asked questions\u003c\/strong\u003e\u003c\/h1\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat are VST Syringe Filters used for?\u003c\/summary\u003e\n\u003cp\u003eVST Syringe Filters clarify and degas espresso or coffee samples before taking refractometer measurements. They remove fine suspended solids and CO2 gas that would otherwise cause inaccurate or inconsistent TDS readings.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhy do I need to filter my espresso before using a refractometer?\u003c\/summary\u003e\n\u003cp\u003eUnfiltered espresso contains fine undissolved particles that reflect light instead of refracting it, producing erratic readings. Additionally, CO2 from freshly roasted coffee reduces the refractive index of the liquid, causing your TDS measurement to read lower than the actual value.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use these filters for filter coffee as well as espresso?\u003c\/summary\u003e\n\u003cp\u003eYes - VST Syringe Filters work well with filter coffee brewed using perforated metal discs or woven mesh filters such as those used with the AeroPress or certain pour-over devices. Paper-filtered coffee typically requires less filtration but can still benefit from degassing.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow many times can I use each filter?\u003c\/summary\u003e\n\u003cp\u003eEach syringe filter is designed for single use only. Reusing filters can compromise measurement accuracy and may introduce contamination from previous samples.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat syringes are compatible with VST Syringe Filters?\u003c\/summary\u003e\n\u003cp\u003eThe filters are designed for use with Luer-Lok tip syringes. VST recommends 10ml Luer-Lok tip syringes for optimal performance. The 100-pack includes five syringes to get you started.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between the 50-pack and 100-pack?\u003c\/summary\u003e\n\u003cp\u003eThe 100-filter pack includes five reusable syringes, making it ideal if you're just getting started with refractometry. The 50-filter pack does not include syringes and is best suited for those who already own compatible Luer-Lok syringes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow do VST Syringe Filters help maintain measurement precision?\u003c\/summary\u003e\n\u003cp\u003eBy removing both particulate matter and dissolved CO2, these filters ensure your sample meets the conditions required for accurate refractometer readings. VST developed them specifically to maintain their ±0.01% precision specification.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre these filters useful for comparing espresso baskets?\u003c\/summary\u003e\n\u003cp\u003eYes - they're particularly helpful for troubleshooting and benchmarking filter basket performance, whether you're testing single, double, or triple baskets during equipment setup or comparing consistency across machines.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow should I store VST Syringe Filters?\u003c\/summary\u003e\n\u003cp\u003eStore them in a cool, dry environment away from direct sunlight. Keep them sealed until use to maintain their integrity and filtration performance.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to use VST filters with a VST refractometer specifically?\u003c\/summary\u003e\n\u003cp\u003eNo - while VST developed these filters to complement their own refractometers and precision standards, they can be used with any refractometer where accurate, repeatable coffee measurements are required.\u003c\/p\u003e\n\u003c\/details\u003e","brand":"VST","offers":[{"title":"Bag of 50 Filters (No Syringes Included)","offer_id":31794266243125,"sku":"VST (Filter50)","price":90.0,"currency_code":"GBP","in_stock":true},{"title":"Bag of 100 Filters (Incl. 5 Syringes)","offer_id":234800538,"sku":"VST (Filter100)","price":170.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0023\/1572\/products\/VST-Coffee-expresso-syringe-filters.jpg?v=1571262461","url":"https:\/\/ozonecoffee.mom\/products\/vst-syringe-filters","provider":"Ozone Coffee UK","version":"1.0","type":"link"}