{"product_id":"apera-grostar-gs1-p-ph-orp-pen-tester-hydroponics","title":"Apera GroStar GS1-P pH \u0026 ORP Pen Tester Kit – Hydroponics \u0026 Disinfection","description":"\u003ch1\u003eApera Instruments GroStar GS1-P pH \u0026amp; ORP Pen Tester Kit\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eGroStar GS1-P\u003c\/strong\u003e is the go-to pen tester for hydroponic growers who need both \u003cstrong\u003epH and ORP (oxidation-reduction potential)\u003c\/strong\u003e in a single device. Monitor nutrient solution acidity and disinfection effectiveness — chlorine, hydrogen peroxide, ozone — without switching instruments. Built with a \u003cstrong\u003edouble-junction pH probe\u003c\/strong\u003e that resists fouling from nutrient-rich solutions, the GS1-P delivers professional-grade accuracy in a rugged, water-resistant pen format.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Choose the GS1-P?\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003epH + ORP + Temperature in One Device\u003c\/strong\u003e — consolidates disinfection and nutrient monitoring into a single pen tester\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDouble-Junction pH Probe\u003c\/strong\u003e — actively prevents reference contamination from complex nutrient solutions, extending sensor lifespan vs. standard single-junction testers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisinfection Monitoring\u003c\/strong\u003e — ORP measurement tracks effectiveness of chlorine, H₂O₂, ozone, and other sanitizers in recirculating systems\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged, Water-Resistant Housing\u003c\/strong\u003e — built for the high-humidity environments of grow rooms, greenhouses, and grow tents\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Ready-to-Use Kit\u003c\/strong\u003e — arrives with calibration solutions and carrying case; no additional accessories needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimal Storage at 15–25°C\u003c\/strong\u003e — standard room temperature storage for long probe life\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eHydroponics: nutrient solution pH and sanitizer ORP monitoring\u003c\/li\u003e\n\u003cli\u003eAquaponics: water quality and disinfection tracking\u003c\/li\u003e\n\u003cli\u003eGreenhouse and indoor grow room management\u003c\/li\u003e\n\u003cli\u003eRecirculating systems with chlorine, ozone, or peroxide treatment\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eGroStar 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\u003eParameters\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\u003eGS1\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003epH, Temperature\u003c\/td\u003e\n\u003ctd\u003eGeneral hydroponic nutrient solutions\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGS2\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003epH, Temperature (Soil Probe)\u003c\/td\u003e\n\u003ctd\u003eDirect soil and solid growing media testing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGS3\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eEC, 500ppm, 700ppm, Temperature\u003c\/td\u003e\n\u003ctd\u003eNutrient salt concentration monitoring\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGS4\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003epH, EC, 500ppm, 700ppm, Temperature\u003c\/td\u003e\n\u003ctd\u003eAll-in-one liquid nutrient testing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong style=\"color:#0088cc;\"\u003eGS1-P\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong style=\"color:#0088cc;\"\u003epH, ORP, Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong style=\"color:#0088cc;\"\u003eHydroponics + disinfection monitoring\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eGS4-P\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003epH, EC, 500\/700ppm, ORP, Temperature\u003c\/td\u003e\n\u003ctd\u003eComplete multi-parameter + hygiene tracking\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 Parameters\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003epH, ORP, Temperature\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003epH Probe Design\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDouble-junction (nutrient fouling resistant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTarget Market\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHydroponics, Indoor Growing, Aquaponics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFormat\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eComplete Kit (1-EA) with carrying case\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\u003e1.9 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 × 8 × 2 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e","brand":"APERA Instruments","offers":[{"title":"Default Title","offer_id":44162449702999,"sku":"GS1-P","price":176.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1555\/0581\/files\/gs1_ph_5d19a21b-fa24-4c82-8f1e-5cb62a939b75.avif?v=1786652896","url":"https:\/\/getultimatenow.com\/products\/apera-grostar-gs1-p-ph-orp-pen-tester-hydroponics","provider":"Get Ultimate Now ","version":"1.0","type":"link"}