{"product_id":"hanna-groline-hi98131-ph-ec-tds-temperature-tester","title":"Hanna GroLine Waterproof pH\/EC\/TDS\/Temperature Tester HI98131","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Hanna GroLine HI98131 Waterproof pH\/EC\/TDS\/Temperature Tester gives hydroponic, greenhouse, aquaponic, and indoor growers four essential nutrient-solution measurements in one compact meter. Use it to monitor pH, electrical conductivity, total dissolved solids, and temperature without carrying several separate testers.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIts rugged waterproof housing is designed for humid growing environments and floats if accidentally dropped into a reservoir. Simple two-button operation, automatic temperature compensation, selectable TDS conversion factors, and Hanna Quick Cal compatibility make the HI98131 a practical choice for routine nutrient management.\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 pH, EC, TDS, and temperature with one handheld tester\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eWaterproof floating body designed for humid grow environments\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAutomatic temperature compensation for pH and conductivity readings\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSelectable 0.5 and 0.7 EC-to-TDS conversion factors\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReplaceable HI73127 pH electrode extends the useful life of the meter\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eGraphite EC\/TDS sensor helps resist polarization and salt-related measurement errors\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHanna Quick Cal mode calibrates pH and conductivity with one solution\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eStability indicator helps identify when a reading is ready to record\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHOLD function freezes the displayed measurement\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBattery Error Prevention System helps prevent unreliable low-power readings\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAutomatic shutoff options conserve 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\u003epH\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.00 to 14.00 pH\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e0.01 pH\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003e\u003cspan\u003e±0.10 pH\u003c\/span\u003e\u003c\/td\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 3999 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 60.0°C \/ 32.0 to 140.0°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\u003eSelectable TDS Conversion Factors\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eTDS is calculated from the meter’s conductivity measurement. The HI98131 allows growers to select the conversion factor used by their nutrient program:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e\u003cspan\u003e0.5 conversion factor:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e An EC reading 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 conversion factor:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e An EC reading of 1.00 mS\/cm is displayed as approximately 700 ppm.\u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eAlways verify which scale is used by your fertilizer manufacturer before comparing TDS readings with a feeding chart.\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 HI98131 supports several calibration methods:\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003eAutomatic one- or two-point pH calibration using pH 4.01, 7.01, and 10.01 buffers\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eAutomatic one-point EC calibration at 1.41 or 5.00 mS\/cm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eCombined pH and EC calibration using Hanna GroLine Quick Calibration Solution\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eQuick Cal offers a convenient routine calibration for compatible Hanna GroLine equipment. For maximum pH accuracy, particularly after cleaning or replacing the electrode, use a two-point calibration that brackets the expected nutrient-solution pH.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eHow to Take a Measurement\u003c\/span\u003e\u003c\/h3\u003e\n\u003col start=\"1\"\u003e\n\u003cli\u003e\u003cspan\u003eRemove the protective cap and rinse the sensors with distilled or deionized water.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eImmerse the tester in the nutrient solution to the recommended level.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eGently stir the meter to remove trapped air bubbles.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eSelect pH, EC, or TDS using the meter controls.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHold the tester steady until the stability indicator disappears.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRecord the reading or press HOLD to freeze it on the display.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eRinse the sensors after testing and return the meter to proper storage.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eMeasure a well-mixed sample away from concentrated nutrient additions, pH adjusters, air stones, and dosing outlets.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eReplaceable pH Electrode\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe included HI73127 pH electrode can be replaced when its response becomes slow or calibration can no longer be completed successfully. This allows growers to replace the worn sensor instead of discarding the entire tester.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe electrode also features an extractable cloth junction. If readings become slow or unstable because the junction is dirty, approximately 3 mm or 1\/8 inch of fresh cloth can be carefully pulled out and the contaminated portion trimmed away. Follow Hanna’s instructions and avoid pulling out an excessive amount.\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\u003eRinse the tester after every use to prevent fertilizer, organic residue, and mineral deposits from drying on the sensors. If readings begin to drift, stabilize slowly, or fail calibration, soak the sensing area in a compatible Hanna electrode cleaning solution before recalibrating.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eHeavy organic additives and dirty nutrient solutions can coat the sensing surfaces or obstruct the pH reference junction. Routine rinsing and periodic cleaning help maintain dependable response times.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eProper Probe Storage\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eKeep the pH glass bulb hydrated in Hanna electrode storage solution. The protective cap contains an internal reservoir that can be filled with storage solution to keep the sensor moist between uses.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eNever store the pH electrode in distilled or deionized water. Pure water can damage the reference system and shorten electrode life. If the electrode dries out, rehydrate it in storage solution before calibration and use.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eBattery Protection\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe meter displays its battery level at startup and includes a low-battery indicator. Hanna’s Battery Error Prevention System automatically shuts the tester down when battery power becomes too low to provide dependable measurements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe selectable automatic shutoff can be set for 8 minutes, 60 minutes, or disabled.\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 HI98131 combo tester\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eReplaceable HI73127 pH electrode\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eElectrode removal tool\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\u003eElectrode cleaning solution sachet\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eStorage cap\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eBatteries\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 long-term performance, pair the HI98131 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 pH 4.01 Calibration Buffer\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHanna GroLine pH 7.01 Calibration Buffer\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHanna GroLine Conductivity Standards\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\u003eHanna pH Probe Storage Solution\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003eHanna HI73127 Replacement pH Electrode\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eCalibration, cleaning, and storage solutions should be replaced regularly and should never be poured back into their original containers after use.\u003c\/span\u003e\u003c\/p\u003e","brand":"Hanna Instruments","offers":[{"title":"Default Title","offer_id":32085751949,"sku":"HI98131","price":188.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1298\/4199\/products\/HANNA_-GroLine-Hydroponic-Waterproof-Pocket-pH-EC-TDS-Temperature-Tester-Hanna-Instruments-1672079009.jpg?v=1683705559","url":"https:\/\/www.gardensupplyguys.com\/products\/hanna-groline-hi98131-ph-ec-tds-temperature-tester","provider":"GARDEN SUPPLY GUYS","version":"1.0","type":"link"}