{"product_id":"hanna-groline-hi98318-waterproof-ec-tds-ppm-tester","title":"Hanna GroLine Waterproof EC\/TDS (PPM) Tester HI98318","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Hanna GroLine HI98318 Waterproof EC\/TDS Tester provides a fast, convenient way to measure fertilizer concentration in hydroponic nutrient solutions. Its pocket-sized design, large dual-level display, selectable PPM scales, and automatic temperature compensation make it an excellent everyday meter for hydroponic gardens, greenhouses, aquaponic systems, and indoor growing environments.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HI98318 displays EC or TDS alongside solution temperature, allowing growers to quickly determine whether a reservoir is within the desired nutrient-strength range. Its graphite conductivity sensor helps reduce the polarization effects commonly associated with conventional two-pin metal testers.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eKey Benefits\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMeasures electrical conductivity in mS\/cm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDisplays TDS using selectable 500 or 700 PPM scales\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDisplays nutrient-solution temperature\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWaterproof housing designed for humid growing environments\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eGraphite conductivity sensor reduces polarization effects\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAutomatic temperature compensation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eLarge, easy-to-read dual-level LCD\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSimple two-button operation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAutomatic single-point calibration\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCompatible with Hanna Quick Calibration Solution\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eStability, calibration, and low-battery indicators\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSelectable automatic shutoff\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eApproximately 250 hours of continuous battery life\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eMeasurement Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003ctable\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e\u003cspan\u003eParameter\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eRange\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eResolution\u003c\/span\u003e\u003c\/th\u003e\n\u003cth\u003e\u003cspan\u003eAccuracy\u003c\/span\u003e\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eEC\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.00 to 6.00 mS\/cm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.01 mS\/cm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e±2% full scale\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTDS, 0.5 factor\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 3000 ppm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10 ppm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e±2% full scale\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTDS, 0.7 factor\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0 to 4000 ppm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e10 ppm\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e±2% full scale\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan\u003eTemperature\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.0 to 50.0°C \/ 32.0 to 122.0°F\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.1°C \/ 0.1°F\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e±0.5°C \/ ±1°F\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003e\u003cspan\u003eUnderstanding EC and TDS\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eElectrical conductivity measures how effectively a solution conducts electricity. As dissolved fertilizer salts increase, conductivity generally increases. This makes EC a useful measurement for monitoring the overall concentration of a hydroponic nutrient solution.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eTDS or PPM is calculated from the EC measurement using a conversion factor. Because different fertilizer manufacturers use different conversion scales, the HI98318 allows the user to select either:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e0.5 or 500 PPM scale:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e An EC value of 1.00 mS\/cm is displayed as approximately 500 ppm.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e0.7 or 700 PPM scale:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e An EC value of 1.00 mS\/cm is displayed as approximately 700 ppm.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eDirect EC display:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Results are shown in mS\/cm without conversion to PPM.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAlways confirm which conversion scale is used by your nutrient manufacturer before comparing the meter’s PPM reading with a feeding chart.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eGraphite Conductivity Sensor\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HI98318 uses a graphite conductivity sensor that helps minimize polarization effects. Polarization can occur with conventional two-pin metal testers and may contribute to unstable or less repeatable measurements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe graphite sensor provides dependable conductivity readings while standing up to regular use in fertilizer-rich hydroponic solutions.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eAutomatic Temperature Compensation\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eConductivity changes as solution temperature changes. The HI98318 automatically compensates EC and TDS readings between 0 and 50°C, helping growers compare nutrient-strength measurements taken under different reservoir conditions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe integrated temperature sensor also displays the measured temperature on the secondary portion of the LCD.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCalibration Options\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HI98318 offers automatic single-point calibration using either:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e1.41 mS\/cm conductivity standard\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e in standard calibration mode\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eHanna Quick Calibration Solution\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e at 5.00 mS\/cm in Quick Cal mode\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe meter automatically recognizes the appropriate calibration standard and stores the calibration after the reading stabilizes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor dependable results, Hanna recommends calibrating at least once per month and more frequently when high accuracy is required, when readings appear unusual, or after cleaning the sensor.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eHow to Use\u003c\/span\u003e\u003c\/h3\u003e\n\u003col start=\"1\"\u003e\n\u003cli\u003e\u003cspan\u003eRemove the protective cap and rinse the probe with purified water.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTurn on the meter and confirm that the battery level is sufficient.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eImmerse the probe approximately 3 cm or 1.18 inches into the nutrient solution.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eGently stir the meter to release trapped air bubbles.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWait for the stability indicator to disappear.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRead the EC or TDS measurement on the main display and temperature on the secondary display.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRinse the probe with clean water after testing.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReplace the protective cap before storing the meter.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor the most representative reading, test a well-mixed reservoir away from concentrated nutrient additions, dosing outlets, and recently added pH adjusters.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCalibration Best Practices\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCalibration accuracy depends on the condition of the calibration standard. For the best results:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eUse fresh calibration solution for each calibration.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePour the required solution into a clean separate container.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNever pour used calibration standard back into its original container.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRinse the probe with purified water before calibration.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAvoid touching or wiping the graphite sensing surfaces.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReplace contaminated or expired calibration solution.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eCleaning and Maintenance\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eRinse the probe with clean water after every measurement. Nutrient residue, mineral deposits, or organic additives left on the sensor can interfere with response time and measurement stability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIf readings become slow, inconsistent, or difficult to calibrate, clean the sensing area with a compatible Hanna electrode cleaning solution. Rinse thoroughly before recalibrating.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eUnlike a pH electrode, the HI98318 conductivity probe does not require storage solution. Replace the protective cap after cleaning and allow the meter to remain clean between uses.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eBattery and Automatic Shutoff\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HI98318 operates on a replaceable CR2032 battery and provides approximately 250 hours of continuous use. The remaining battery percentage appears when the meter starts, and a low-battery symbol flashes when power drops below approximately 10%.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAutomatic shutoff can be set for:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e8 minutes\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e60 minutes\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDisabled\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIf the battery becomes too depleted for dependable measurements, the meter displays a battery warning and turns itself off.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWhat’s Included\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eHanna GroLine HI98318 EC\/TDS tester\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eProtective cap\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHanna Quick Calibration Solution sachets\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCR2032 battery\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eQuality certificate\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInstruction manual\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eRecommended Accessories\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor reliable calibration and maintenance, pair the HI98318 with:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eHanna GroLine Quick Calibration Solution\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHanna GroLine 1413 µS\/cm Conductivity Standard Solution\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHanna General Purpose Cleaning Solution\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eClean calibration beakers or sample cups\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eFresh calibration standards and routine sensor cleaning help maintain accurate, repeatable nutrient measurements.\u003c\/span\u003e\u003c\/p\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":32088115405,"sku":"HI98318","price":89.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1298\/4199\/products\/HANNA_-GroLine-Waterproof-EC-TDS-_ppm_-Tester-Hanna-Instruments-1672087239.jpg?v=1672087240","url":"https:\/\/www.gardensupplyguys.com\/products\/hanna-groline-hi98318-waterproof-ec-tds-ppm-tester","provider":"GARDEN SUPPLY GUYS","version":"1.0","type":"link"}