{"product_id":"hanna-groline-ec-tds-truncheon-tester-hi98330","title":"Hanna GroLine Nutrient EC\/TDS Truncheon Tester HI98330","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Hanna GroLine Nutrient EC\/TDS Truncheon Tester HI98330 is a rugged, waterproof meter designed for quick conductivity checks in hydroponic reservoirs, irrigation tanks, fertilizer solutions, and other agricultural applications. It measures electrical conductivity in mS\/cm and displays the corresponding TDS concentration on both the 500 ppm and 700 ppm scales.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eSimply place the tester in the nutrient solution and stir. The HI98330 turns on automatically, compensates for solution temperature, and displays the stabilized reading through 24 bright blue LEDs. Its extended measurement range supports everything from lighter seedling solutions to concentrated flowering and fruiting formulas.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eKey Benefits\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eThree measurement scales:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Displays EC, 500-scale TDS, and 700-scale TDS simultaneously.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eExtended nutrient range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Measures EC up to 6.0 mS\/cm, 3,000 ppm on the 500 scale, or 4,200 ppm on the 700 scale.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eNo user calibration required:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The tester is factory calibrated for straightforward operation.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAutomatic activation:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Turns on when placed in a conductive nutrient solution.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAutomatic shutoff:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Powers down 30 seconds after the measurement stabilizes.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTemperature-compensated results:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e An integrated temperature sensor automatically compensates conductivity readings from 41–122°F.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eIP67 waterproof construction:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Withstands temporary water immersion when the battery cap is correctly secured.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eFloating design:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Floats for easier retrieval if accidentally released into a reservoir.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eBuilt for stirring:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The durable truncheon-style body can stir the nutrient solution while taking a measurement.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eHighly visible LED scale:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Uses 24 bright blue LEDs instead of a small digital display.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eLow-battery indication:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Displays battery status when activated.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eEasy sensor access:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The detachable crown-shaped cap simplifies cleaning around the graphite electrodes.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eWhy Measure EC and TDS?\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eElectrical conductivity indicates the concentration of dissolved ionic nutrients in water. Monitoring EC helps growers determine whether a nutrient solution is too weak, within the desired feeding range, or concentrated enough to increase the risk of fertilizer stress.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eTDS expresses that conductivity as an estimated parts-per-million value. Because different nutrient manufacturers and meters use different conversion factors, the HI98330 displays both common TDS scales:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e500 ppm scale:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Converts EC using a 0.5 factor.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e700 ppm scale:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Converts EC using a 0.7 factor.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAlways compare readings with the scale specified by the nutrient manufacturer or feeding chart. A result of 2.0 mS\/cm corresponds to approximately 1,000 ppm on the 500 scale and 1,400 ppm on the 700 scale.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eMeasurement Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eEC Range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.2–6.0 mS\/cm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eEC Resolution:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.1 mS\/cm from 0.2–4.0 mS\/cm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eHigh-Range EC Resolution:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.25 mS\/cm from 4.0–6.0 mS\/cm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e500-Scale TDS Range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 100–3,000 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e500-Scale TDS Resolution:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 50 ppm from 100–2,000 ppm and 125 ppm from 2,000–3,000 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e700-Scale TDS Range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 140–4,200 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e700-Scale TDS Resolution:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 70 ppm from 140–2,800 ppm and 175 ppm from 2,800–4,200 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAccuracy:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ±4% of the reading plus one resolution point\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eCalibration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Factory calibrated\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTemperature Compensation:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Automatic from 41–122°F, or 5–50°C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eOperating Environment:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 32–122°F, or 0–50°C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSensor Type:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Graphite conductivity electrodes\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eDisplay:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 24 blue LEDs\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eEnclosure Rating:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e IP67 waterproof and floating\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003ePower Supply:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Three AA alkaline batteries\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eEstimated Battery Life:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Approximately three years at ten measurements per day\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eInstrument Length:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Approximately 17.5 inches\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eWarranty:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Six-year manufacturer warranty\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eUnderstanding the LED Display\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HI98330 has its EC and TDS scales printed directly on the tester body. Illuminated LEDs identify the measured nutrient concentration without requiring the user to switch between measurement modes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eWhen a reading falls between two marked values, two adjacent LEDs illuminate. The correct measurement is the midpoint between those values. For example, illumination at 3.2 and 3.4 mS\/cm represents an EC reading of approximately 3.3 mS\/cm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFlashing LEDs indicate that the measurement is still stabilizing. Once the reading stabilizes, the LEDs remain steady and the tester begins its 30-second automatic shutoff period.\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 from the sensor end.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003ePlace the graphite electrodes into the nutrient solution.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUse the tester to gently stir the solution.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMake sure the sensor area is completely submerged and free from trapped air bubbles.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWait for the blue LED reading to stabilize.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRead the EC, 500 ppm, or 700 ppm value from the printed scales.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRemove the tester from the solution.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRinse the sensor area after use.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAllow excess water to drain before replacing the cap.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA change in conductivity resets the automatic shutoff timer. To take another reading after the tester turns off, remove it from the solution and place it back into the liquid.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eBest Practices for Reliable Measurements\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMix the reservoir thoroughly before testing.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eMeasure away from concentrated nutrient injection points.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAvoid testing immediately after adding fertilizer.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAllow nutrient concentrates to disperse completely before taking a final reading.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eKeep air bubbles from collecting between the graphite electrodes.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRinse the tester after every use to prevent fertilizer buildup.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCompare results with the correct 500 ppm, 700 ppm, or EC feeding scale.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTest source water before adding fertilizer when calculating the actual nutrient contribution.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUse a clean conductivity standard periodically to verify performance.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe HI98330 is factory calibrated and does not provide a user-calibration procedure. If readings remain questionable after cleaning and verification with a fresh standard, contact Hanna Instruments for service guidance.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCleaning and Maintenance\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eQuickly rinse the sensor end after each measurement to prevent fertilizer salts from accumulating between the graphite electrodes.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor more thorough cleaning:\u003c\/span\u003e\u003c\/p\u003e\n\u003col start=\"1\"\u003e\n\u003cli\u003e\u003cspan\u003eRotate and remove the crown-shaped sensor cap.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRinse the exposed sensor area under running tap water.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUse a soft-bristled brush and mild soapy surfactant to clean between the electrodes.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eDo not use abrasive materials or metal tools.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRinse thoroughly and shake off excess water.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAllow the tester to dry before storage.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReinstall the protective cap.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eStore the tester clean and dry. Unlike a glass pH electrode, the graphite EC sensors do not need to be stored in electrode storage solution.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eBattery Replacement\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe meter displays its battery status when activated. Replace the batteries when the low-battery warning appears, since nearly depleted batteries may affect measurement performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eUse three matching 1.5-volt AA alkaline batteries. Do not combine old and new batteries or mix different battery brands. Secure the battery cap tightly after replacement to maintain the tester’s IP67 protection.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eWhat Is Included\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eHanna GroLine HI98330 Nutrient EC\/TDS Tester\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThree AA alkaline batteries\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eQuick reference guide\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eInstrument quality certificate\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eImportant Usage Notes\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eMeasures EC and calculated TDS only; it does not measure pH.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe integrated temperature sensor provides automatic compensation but does not display temperature.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUse the correct TDS scale when comparing readings with a fertilizer schedule.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eThe floating design assists with retrieval but does not make the HI98330 a continuous reservoir monitor.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRemove the tester after taking a measurement and store it clean and dry.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEnsure the battery compartment is fully closed before immersing the tester.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eFollow the current Hanna Instruments manual for operation, cleaning, battery replacement, and warranty service.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":44516961026212,"sku":"HI98330","price":98.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1298\/4199\/files\/HANNA_-GroLine-Nutrient-EC-TDS-_ppm_-Tester-1689457716199.jpg?v=1689457717","url":"https:\/\/www.gardensupplyguys.com\/products\/hanna-groline-ec-tds-truncheon-tester-hi98330","provider":"GARDEN SUPPLY GUYS","version":"1.0","type":"link"}