{"product_id":"apera-instruments-5031-tds-pen-tester-drinking-water-ro","title":"Apera Instruments 5031 TDS Pen Tester – Drinking Water \u0026 RO System Meter","description":"\u003ch1\u003eApera Instruments 5031 TDS Pen Tester\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eApera 5031\u003c\/strong\u003e is a pocket-size TDS (Total Dissolved Solids) pen tester built for fast, reliable water purity checks at home, in the lab, or in the field. Part of the Eco Series, it features a \u003cstrong\u003ededicated fixed TDS sensor\u003c\/strong\u003e optimized for rapid stabilization and accurate readings — ideal for verifying drinking water quality, monitoring reverse osmosis (RO) system output, and checking general water purity. At just 6 oz, it slips into any pocket or water testing kit for instant, on-the-spot TDS measurement.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose the Apera 5031?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated TDS Sensor\u003c\/strong\u003e — fixed, parameter-specific probe delivers fast stabilization and accurate total dissolved solids readings without cross-parameter interference\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-Compact \u0026amp; Lightweight\u003c\/strong\u003e — 6 oz; fits in any pocket, under-sink kit, or field bag for true on-the-go testing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimple Point-and-Read Operation\u003c\/strong\u003e — no complex menus; instant TDS verification for homeowners, RO system users, and field technicians\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCost-Effective\u003c\/strong\u003e — professional-grade TDS accuracy at an economical price; no expensive lab instrument required\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy Maintenance\u003c\/strong\u003e — rinse and store at room temperature (15–25°C); minimal upkeep required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDrinking water quality verification: tap water, filtered water, bottled water\u003c\/li\u003e\n\u003cli\u003eReverse osmosis (RO) systems: pre- and post-filter TDS monitoring\u003c\/li\u003e\n\u003cli\u003eWater softeners and filtration systems: performance verification\u003c\/li\u003e\n\u003cli\u003eHydroponics and aquaponics: nutrient solution TDS checks\u003c\/li\u003e\n\u003cli\u003eAquariums: water purity and mineral content monitoring\u003c\/li\u003e\n\u003cli\u003eEnvironmental field sampling: general water quality screening\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eEco Series Model Comparison\u003c\/h2\u003e\n\u003ctable border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eBest For\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e5021\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eConductivity (EC)\u003c\/td\u003e\n\u003ctd\u003eGeneral water conductivity \u0026amp; hydroponics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong style=\"color:#1a00cc;\"\u003e5031\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong style=\"color:#1a00cc;\"\u003eTDS\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong style=\"color:#1a00cc;\"\u003eDrinking water, RO systems, purity checks\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e5041\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eORP\u003c\/td\u003e\n\u003ctd\u003ePools, spas, disinfection monitoring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e5051\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSalinity\u003c\/td\u003e\n\u003ctd\u003eGeneral salinity monitoring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e5052\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSaltwater Salinity\u003c\/td\u003e\n\u003ctd\u003eSaltwater aquariums \u0026amp; marine testing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e5053\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNaCl Salinity\u003c\/td\u003e\n\u003ctd\u003eSodium chloride concentration checks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003ctable border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasured Parameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTotal Dissolved Solids (TDS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSensor Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFixed, dedicated TDS sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFormat\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSingle Unit (1-EA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStorage Conditions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e15–25°C (room temperature)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e6 oz (approx. 0.375 lbs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSeries\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEco Series Compact Pen Testers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"APERA Instruments","offers":[{"title":"Default Title","offer_id":44162474672215,"sku":"5031","price":52.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1555\/0581\/files\/5053_6315a0db-5c13-4c7e-a88a-623ffe3add59.avif?v=1786655434","url":"https:\/\/getultimatenow.com\/products\/apera-instruments-5031-tds-pen-tester-drinking-water-ro","provider":"Get Ultimate Now ","version":"1.0","type":"link"}