{"product_id":"hanna-groline-hydroponic-nutrient-monitor-hi981421-01","title":"Hanna GroLine Hydroponic Nutrient Monitor with Inline Probe HI981421-01","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Hanna GroLine Hydroponic Nutrient Monitor HI981421-01 provides continuous, around-the-clock monitoring of pH, electrical conductivity, TDS, and temperature in hydroponic nutrient solutions. Designed for hydroponic gardens, aquaponic systems, greenhouses, and commercial growing facilities, it gives growers an immediate view of the conditions affecting nutrient availability and plant performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe included Hanna HI1285-9 multiparameter probe combines pH, EC\/TDS, and temperature sensors inside one durable PVC body. It can remain continuously immersed or be installed through its 3\/4-inch threaded connection for inline, flow-through monitoring. Readings appear together on the large, plant-friendly green LCD, while programmable alarms and automatic data logging help identify unwanted changes before they become larger crop problems.\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\u003eContinuous nutrient monitoring:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Tracks pH, EC or TDS, and temperature 24 hours a day.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eOne probe, three measurements:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The included HI1285-9 probe measures all essential nutrient-solution parameters from a single installation point.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eInline or immersed installation:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Use the probe in a reservoir or install it in compatible plumbing with its 3\/4-inch threaded connection.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAutomatic data logging:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Records measurements every 15 minutes and retains the most recent 30 days of data.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTrend analysis:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Stores minimum, maximum, and average values to help growers recognize recurring changes.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eHigh and low alarms:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The display flashes when a monitored parameter moves beyond its programmed limits.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eQuick Cal compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Calibrates pH and EC using one convenient Hanna Quick Cal solution.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eIndependent calibration options:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Supports standard pH buffers and dedicated conductivity standards when separate calibration is preferred.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTemperature-compensated readings:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Automatically compensates pH and conductivity measurements for temperature variations.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eSelectable TDS conversion:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Choose a 0.5 or 0.7 EC-to-TDS conversion factor.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eUSB-C data transfer:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Export stored measurement data to a compatible computer or memory device.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eGreen backlit display:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Provides clear visibility while minimizing disruptive light inside the growing environment.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAutomatic display dimming:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e An ambient light sensor adjusts screen brightness as surrounding conditions change.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eIP65-rated enclosure:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Protects the monitor from dust, particles, and water jets in demanding grow environments.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eGLP calibration history:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Stores information from the five most recent pH and EC calibrations.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eMeasurement Specifications\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eModel:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e HI981421-01\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMeasured parameters:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e pH, EC, TDS, and temperature\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003epH range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.00 to 14.00 pH\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003epH resolution:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.01 pH\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003epH accuracy:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ±0.05 pH at 25°C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eEC range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.00 to 10.00 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 0.01 mS\/cm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eEC accuracy from 0.00 to 5.00 mS\/cm:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ±0.1 mS\/cm at 25°C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eEC accuracy from 5.00 to 10.00 mS\/cm:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ±0.2 mS\/cm at 25°C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTDS range with 0.5 conversion factor:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0 to 5,000 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTDS range with 0.7 conversion factor:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0 to 7,000 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTDS resolution:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 10 ppm\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTDS accuracy:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ±2% of full scale at 25°C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTemperature range:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.0 to 60.0°C \/ 32.0 to 140.0°F\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTemperature resolution:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 0.1°C \/ 0.1°F\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eTemperature accuracy:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e ±0.5°C \/ ±1°F at 25°C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eEC temperature coefficient:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 1.9% per °C\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eLogging interval:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Every 15 minutes\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eLogging history:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Most recent 30 days\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eAlarm types:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Programmable high and low alarms for each parameter\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eData connection:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e USB Type-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 -5 to 50°C \/ 23 to 122°F\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eMaximum relative humidity:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 95% non-condensing\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eEnclosure rating:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e IP65\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003ePower supply:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Included 12 VDC adapter\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eHI1285-9 Multiparameter Probe\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe included HI1285-9 probe combines three sensors inside one rugged PVC housing:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eA pH electrode for monitoring nutrient-solution acidity or alkalinity\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn amperometric conductivity sensor for EC and TDS measurement\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAn internal temperature sensor for temperature readings and automatic compensation\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIts pre-amplified design supports stable measurement in electrically active grow environments. The probe is designed for continuous immersion at depths of up to two meters and includes a 3\/4-inch threaded connection for installation into compatible piping.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eDisplay and Alarm Functions\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe large LCD can display pH, EC or TDS, and temperature together for quick system checks. Growers can also select a rotating single-parameter view or review real-time graphs and stored logs directly on the monitor.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eProgrammable high and low limits can be established for every measured parameter. When a reading moves beyond the selected range, the display flashes with a warning message so the nutrient solution can be inspected and corrected.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe ambient light sensor automatically adjusts the green display backlight as lighting conditions change.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eAutomatic Data Logging\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe GroLine Monitor automatically records measurements every 15 minutes and maintains a rolling 30-day history. Minimum, maximum, and average values are stored to help identify:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eGradual pH drift\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRising or falling nutrient strength\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTemperature fluctuations\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eChanges associated with irrigation cycles\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRepeating environmental or equipment-related patterns\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eStored records can be exported through the USB-C connection for additional review, documentation, or long-term recordkeeping.\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 monitor provides two approaches to calibration:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eQuick Cal:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Perform convenient one-point pH and conductivity calibration with Hanna Quick Cal solution.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eStandard pH calibration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Complete one- or two-point calibration using recognized pH 4.01, 7.01, or 10.01 buffers.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003eStandard EC calibration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Complete one-point conductivity calibration using a 1.41 or 5.00 mS\/cm conductivity standard.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCalibrate regularly and whenever readings appear questionable, the probe has been cleaned, or the nutrient solution requires especially precise management. Always use fresh calibration solution and follow the Hanna instruction manual.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eInstallation Options\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor reservoir monitoring, suspend the probe so its sensors remain continuously immersed in a representative, well-mixed portion of the nutrient solution. Avoid placing it directly beside concentrated nutrient injection points, sediment accumulation, or stagnant water.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eFor inline monitoring, use the probe’s 3\/4-inch threaded connection with compatible plumbing. Install it where the sensors will remain in continuous contact with the moving solution and follow Hanna’s instructions for orientation, sealing, and immersion.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eMount the display where it can be viewed easily and where the operating temperature and humidity remain within the published specifications.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eCare and Maintenance\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eInspect the probe regularly for nutrient salts, algae, mineral deposits, and organic residue.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eClean the probe with an appropriate Hanna electrode-cleaning solution when readings become slow or unstable.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRinse away cleaning solution before calibration or returning the probe to service.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eUse fresh calibration standards and never pour used solution back into its original container.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRecalibrate after cleaning or extended storage.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAvoid scratching or aggressively wiping the pH glass.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eNever exceed the probe’s specified immersion depth.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eProtect the monitor’s connections and power supply from condensation and standing water.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReview calibration history and alarm events as part of routine reservoir maintenance.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan\u003eWhat Is Included\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eHanna HI981421 GroLine Hydroponic Nutrient Monitor\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHanna HI1285-9 multiparameter inline probe\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHanna Quick Cal solution sachets\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHanna agricultural electrode-cleaning solution sachets\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e12 VDC power adapter\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eQuality certificates\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\u003eImportant Usage Notes\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eThe HI981421-01 monitors nutrient-solution conditions but does not automatically add nutrients, adjust pH, operate dosing pumps, or control irrigation equipment.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eTDS values are calculated from conductivity using the selected 0.5 or 0.7 conversion factor.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eEstablish target ranges according to the crop, growth stage, fertilizer program, water source, and growing medium.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003eAlarms alert the grower to an out-of-range condition; they do not correct that condition automatically.\u003c\/span\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eFor dependable comparisons, maintain consistent probe placement, solution circulation, calibration practices, and TDS conversion settings.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":40021636621,"sku":"HI981421","price":495.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1298\/4199\/products\/HANNA_-GroLine-Hydroponic-Monitor-w--INLINE-PROBE-for-pH_-EC_-TDS_-Temperature-Hanna-Instruments-1670272045.jpg?v=1670272046","url":"https:\/\/www.gardensupplyguys.com\/products\/hanna-groline-hydroponic-nutrient-monitor-hi981421-01","provider":"GARDEN SUPPLY GUYS","version":"1.0","type":"link"}