{"product_id":"apera-instruments-5041-orp-pen-tester-pool-spa-disinfection","title":"Apera Instruments 5041 ORP Pen Tester – Pool, Spa \u0026 Water Disinfection Meter","description":"\u003ch1\u003eApera Instruments 5041 ORP Pen Tester\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eApera 5041\u003c\/strong\u003e is a pocket-size ORP (Oxidation-Reduction Potential) pen tester built for fast, reliable disinfection monitoring in pools, spas, and water treatment applications. Part of the Eco Series, it features a \u003cstrong\u003ededicated fixed ORP sensor\u003c\/strong\u003e optimized for rapid stabilization and accurate redox readings — instantly verify whether your sanitizer (chlorine, bromine, ozone, or UV) is maintaining effective disinfection levels. At just 6 oz, it slips into any pocket or pool maintenance kit for on-the-spot ORP measurement.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose the Apera 5041?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDedicated ORP Sensor\u003c\/strong\u003e — fixed, parameter-specific probe delivers fast stabilization and accurate oxidation-reduction potential readings without cross-parameter interference\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisinfection Verification\u003c\/strong\u003e — ORP directly measures sanitizer effectiveness; more reliable than residual chlorine alone for confirming safe water quality\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUltra-Compact \u0026amp; Lightweight\u003c\/strong\u003e — 6 oz; fits in any pocket, pool 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 ORP verification for pool technicians, spa operators, and water treatment professionals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCost-Effective\u003c\/strong\u003e — professional-grade ORP 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\u003eSwimming pools and spas: sanitizer effectiveness and disinfection monitoring\u003c\/li\u003e\n\u003cli\u003eHot tubs and whirlpools: ORP-based water quality control\u003c\/li\u003e\n\u003cli\u003eWater treatment and purification: chlorine, bromine, ozone, and UV system verification\u003c\/li\u003e\n\u003cli\u003eAquaculture and aquariums: redox potential monitoring for fish health\u003c\/li\u003e\n\u003cli\u003eFood and beverage: CIP (clean-in-place) sanitizer verification\u003c\/li\u003e\n\u003cli\u003eEnvironmental field sampling: general water oxidation-reduction 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\u003e5031\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTDS\u003c\/td\u003e\n\u003ctd\u003eDrinking water, RO systems, purity checks\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong style=\"color:#cc6600;\"\u003e5041\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong style=\"color:#cc6600;\"\u003eORP\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong style=\"color:#cc6600;\"\u003ePools, spas, disinfection monitoring\u003c\/strong\u003e\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\u003eORP (Oxidation-Reduction Potential)\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 ORP 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":44162499280983,"sku":"5041","price":72.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1555\/0581\/files\/5053_685e9b5b-6968-4181-9674-961a4ffde4ed.avif?v=1786656002","url":"https:\/\/getultimatenow.com\/products\/apera-instruments-5041-orp-pen-tester-pool-spa-disinfection","provider":"Get Ultimate Now ","version":"1.0","type":"link"}