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Properly maintaining your pH pen tester will give you fast, accurate results for longer. So, be sure to order the Milwaukee pH Maitenance Kit code PH-Main at checkout time!¬† This will be needed to help clean and condition the pH electrode before use!Here are our top four tips.¬†1. Always store upright with the cap full of buffer or storage solution MA9015 not water.2. Clean your pH Pen Tester regularly by soaking in cleaning solution MA9016.3. Calibrate after cleaning and\/or storage before testing to adjust for changes in the pH sensor.4. Gently stir the Pen in the sample for a faster result. 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MA9020 is used to check the health and acuracy of an ORP electrode.\u003c\/p\u003e\n\u003cp\u003eMilwaukee solutions are designed to help you achieve reliable and repeatable ORP measurements.\u003c\/p\u003e\n\u003ch2\u003eDESIGN FEATURES\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eOPR 200-275 mV solution value (230 mL).\u003c\/li\u003e\n  \u003cli\u003eFundamental for the correct use of ORP electrodes and for obtaining the most accurate and reproducible readings.\u003c\/li\u003e\n  \u003cli\u003eSealed against light with air tight, tamper proof cap.\u003c\/li\u003e\n  \u003cli\u003eIdeal for fast accuracy check.\u003c\/li\u003e\n  \u003cli\u003eSimply open, pour into a beaker or container and insert the tester or electrode to start the ORP mV check process.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Milwaukee","offers":[{"title":"Default Title","offer_id":58449003249967,"sku":"112260","price":19.25,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/4875\/4479\/files\/a005fde9MA9020__43662.jpg?v=1789033543"},{"product_id":"apera-ph-calibration-kit-ph-4-7-8oz-ea","title":"Apera pH Calibration Kit (pH 4\/7, 8oz. ea)","description":"\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003e\u003cstrong\u003eProduct Details\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cp\u003eGroStar by Apera pH calibration kit (pH 4\/7, 8 oz. each)Kit includes: (1) 8 oz. pH 4.0 calibration solution(1) 8 oz. pH 7.0 calibration solution\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e pH measuring equipment must be cleaned and calibrated regularly to ensure accurate readings.\u003c\/li\u003e\n  \u003cli\u003eHigh accuracy (0. 01 pH): standardized against NIST Certified pH references within 0. 01 pH at 25˚C (77˚F). ideal for the calibration of all pH meters\u003c\/li\u003e\n  \u003cli\u003eColor-coded, double-sealed, 1-year shelf life\u003c\/li\u003e\n  \u003cli\u003eExpiration date and temperature\/ph reference chart provided for reference\u003c\/li\u003e\n  \u003cli\u003eNon-hazardous product\u003c\/li\u003e\n  \u003cli\u003eCalibration Solution should be stored in a cool place out of direct sun and heat.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Apera Instruments","offers":[{"title":"Default Title","offer_id":58449003479343,"sku":"112038","price":18.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/4875\/4479\/files\/e5be135fAI61113_1.jpg?v=1789033556"},{"product_id":"ac-infinity-ph-meter-kit-ph-pen-tester-for-water","title":"AC Infinity pH Meter Kit, pH Pen Tester for Water","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eA pH reader for water quality assessment designed to help monitor and maintain proper pH levels.\u003c\/li\u003e\n  \u003cli\u003eMeasures the acidity, alkalinity, and temperature of water for gardens, aquariums, pools, and more.\u003c\/li\u003e\n  \u003cli\u003eSensor probe with sensitive glass membrane delivers instant pH readings with high accuracy.\u003c\/li\u003e\n  \u003cli\u003eIP-67 rated to be sealed from high-volume moisture, dust, and sand; can also withstand high levels of heat.\u003c\/li\u003e\n  \u003cli\u003eLab-grade pH monitor testing kit includes ready-to-use 4.00 \u0026amp; 7.00 solutions for long-lasting precision.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePRODUCT DESCRIPTION\u003c\/h3\u003e\n\u003cp\u003eA digital water quality meter designed to measure water’s acidity, alkalinity, and temperature to help optimize its quality for gardening and water treatment applications. The highly responsive sensor probe utilizes a lithium glass membrane to instantly determine pH readings with highly precise ±0.1 accuracy. This pH pen tester for water features an IP-67 rating, specially sealed to withstand moisture and heat, as well as block out intrusive dust and sand. For further protection, the hydroponic pH meter is built with a sensor shield to safeguard your probe in between uses. The included 4.00 pH and 7.00 pH calibration solutions ensure consistently accurate measurements, the former also supporting proper storage conditions to help extend the lifespan of the pH and PPM meter.\u003c\/p\u003e\n\u003ch3\u003eAPPLICATIONS\u003c\/h3\u003e\n\u003cp\u003eThis fast-acting nutrient test alkalinity meter will help you determine how well your water uptakes nutrients. Fit for use as a pH meter for plants in horticultural settings like gardens, grow tents, greenhouses, and hydroponics systems. In addition, its application spans far beyond plant growing, capable of being a general pH level tester for water used in swimming pools, spas, aquarium fish tanks, and beverage homebrewing applications to help determine water safety.\u003c\/p\u003e","brand":"AC Infinity","offers":[{"title":"Default Title","offer_id":58449003643183,"sku":"112413","price":59.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/4875\/4479\/files\/6702390dStorePhoto1__39156.jpg?v=1789033575"},{"product_id":"hm-digital-com80-ec-tds-temp-waterproof-hydro-tester","title":"HM Digital COM80 EC\/TDS\/Temp Waterproof Hydro Tester","description":"The COM-80 is an economically priced, reliable EC\/TDS meter that is ideal for testing applications such as hydroponics \u0026amp; gardening, pools \u0026amp; spas, aquariums \u0026amp; reef tanks, water ionizers, drinking water and more.\n\n\nMeasures electrical conductivity (EC), total dissolved solids (TDS).  Excellent for hydroponic nutrient testing.\n\n\nFour scales: EC: , mS;  TDS: ppm, ppt  \n\n\nAutomatic Temperature Compensation (ATC)\n\n\nWater resistant\n\n\nMeasurement Range: 0-9990 ¬¨¬µS; 0-5000 ppm; 0-9.9 mS; 0-5.0 ppt \n\n\nDigital Calibration (push button) to any point within the meter's range\n\n\nAuto-off function, data-hold function and low-battery indicator\n\n\nDisplay: large and easy-to-read LCD screen includes simultaneous temperature reading\n\n\nFactory Calibrated: The COM-80 meter is calibrated with a 1413 ¬¨¬µS solution can be recalibrated with digital calibration using the push buttons\n\n\nIncludes a protective cap and batteries.\n\n\n \n\n\nSPECIFICATIONS\n\n\nEC Range: 0-9990 ¬¨¬µS; 0-9.9 mS  \nTDS Range: 0-5000 ppm (mg\/L); 0-5.0 ppt  \nTemperature Range: 1-80F \nResolution: 1¬¨¬µS\/ppm; 0.1 mS\/ppt   \n     Temp. resolution: 0.1C\/F \nAccuracy: +\/- 2% \nEC-to-TDS Conversion Factor: NaCl (avg of 0.5) \nCalibration: Digital calibration by push button \nProbe: Fixed \nHousing: Water resistant\nPower source: 3 x 1.5V button cell batteries (included)  (model LR44 or equivalent)\nDimensions: 15.3 x 3.2 x 1.8 cm (6.0 x 1.3 x 0.7 inches) \nWeight: 53.9 g (1.9 oz)\n\n\n1 year warranty","brand":"HM Digital","offers":[{"title":"Default Title","offer_id":58449118232879,"sku":"400000013169","price":41.79,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/4875\/4479\/files\/HMDCOM80_1.jpg?v=1789039854"},{"product_id":"luster-leaf®-rapitest®-soil-test-kit-40ct-tests-included-10-ph-10-nitrogen-10-phosphorus-10-potash","title":"Luster Leaf® Rapitest® Soil Test Kit - 40ct - Tests Included : (10) pH, (10) Nitrogen, (10) Phosphorus \u0026 (10) Potash","description":"\u003cp\u003e Determining whether your soil pH needs adjusting or if Nitrogen, phosphorus, and potash should be added in the form of fertilizers. Easy to use, just mix soil and water together, pour off solution into comparator, pour in the powder from the capsule, shake and compare to color chart. \u003c\/p\u003e","brand":"Luster Leaf","offers":[{"title":"Default Title","offer_id":58449128063279,"sku":"113166","price":23.39,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/4875\/4479\/files\/adb11a45505370_20_281_29.jpg?v=1789040760"},{"product_id":"luster-leaf®-rapitest®-ph-soil-tester-contains-10-ph-tests","title":"Luster Leaf® Rapitest® pH Soil Tester - Contains 10 pH Tests","description":"\u003cp\u003e Ideal test to determine soil acidity\/alkalinity. Particularly valuable for adjusting soil conditions for Better-Growing lawns, shrubs, evergreens, and plants. Just mix soil and water, pour off solution into comparator, add tablet, shake, and compare to color chart. It's just that easy. \u003c\/p\u003e","brand":"Luster Leaf","offers":[{"title":"Default Title","offer_id":58449241407791,"sku":"112917","price":8.59,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/4875\/4479\/files\/666bb267505380.jpg?v=1789045277"},{"product_id":"milwaukee-ma871-digital-brix-refractometer","title":"Milwaukee MA871 Digital Brix Refractometer","description":"\u003cp\u003eThe Milwaukee digital BRIX refractometer is temperature compensated with a 0 to 85 percent BRIX range and +\/- 0.2 percent accuracy. It is easy to use with simple two button operation and fast with a response time under 2 seconds. 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Continuous pH\/EC\/TDS\/Temp monitor with rechargeable battery. Portable, wall mount, or benchtop use.HydroMaster HM-500 pH\/EC\/TDS\/¬∞F Tester (113831)\u003cbr\u003e‚Ä¢ Tests pH at a range of 0 pH-14 pH, temperatures from 30¬∞F-176¬∞F, TDS from 0-9999 ppm and EC from 0-9999 ŒºS\u003cbr\u003e‚Ä¢ Stores up to 20 measurement readings, so you can monitor changes over time\u003cbr\u003e‚Ä¢ LCD touch-type screen with auto backlighting\u003cbr\u003e‚Ä¢ Powered by a rechargeable lithium ion battery\u003cbr\u003e‚Ä¢ Features an adjustable alarm that has a high and low set point\u003cbr\u003e‚Ä¢ Automatically turns off after 5 minutes\u003cbr\u003e‚Ä¢ Comes with wall mountable bracket, USB cable, 2 flotation disks, 1 EC\/TDS conductivity sensor, 1 pH sensor, 1 packet each pH 4, pH 7, storage solution, and 1000 ppm calibration solution\u003cbr\u003e‚Ä¢ 110V-220VThree year warranty (6 month warranty on the pH probe)\u003c\/p\u003e","brand":"HM Digital","offers":[{"title":"Default Title","offer_id":58449535598895,"sku":"103855","price":323.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/4875\/4479\/files\/HMD500_1.jpg?v=1789056967"},{"product_id":"bluelab-connect-stick-2","title":"Bluelab Connect Stick 2","description":"\u003cp\u003eGet Connected. Improve crop performance and reduce errors with the power of data and remote monitoring. Receive wireless monitoring data from all Bluelab Connect devices to your computer and smartphone or tablet. Receive important push notifications on your mobile device so you can respond immediately to changes, support growing decisions and improve crop performance. Send wireless data 100m\/330ft to and from Connect devices within the growing environment and up to 400m\/1312ft in open space (line-of-sight). Only one Connect Stick 2 required to receive wireless data from up to 50 Connect devices. Send Bluelab Connect wireless data further in large growing facilities and environments. Simply plug the Bluelab Range Extender 2 into a power supply between Bluelab devices and Bluelab Stick 1 or 2 to increase the wireless signal range. For extra-long distances, multiple Bluelab Range Extender 2s can be used. 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EC (0.4-6.0), CF (4-60) and ppm scales (TDS and 700 scale). Auto sense on and off. Battery life minimum 1 year (or shelf life of battery). Meter length: 40.7cm or 16 1\/32in. 5 year Bluelab Guarantee.\u003c\/p\u003e","brand":"Bluelab","offers":[{"title":"Default Title","offer_id":58449909416239,"sku":"400000035611","price":134.1,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/4875\/4479\/files\/HGC716049-01.jpg?v=1789070451"},{"product_id":"hm-digital-ph-200-waterproof-ph-meter","title":"HM Digital PH-200 Waterproof pH Meter","description":"\u003cp\u003eMeasures pH and temperature. Auto-ranging three point calibration with digital fine tuning. pH buffer 4 solution is in a sponge embedded in a clear cap. Measurement range: 0-14 pH with a waterproof housing. Digital automatic calibration (one point), with digital fine tuning. Auto-off, data-hold functions and low battery indicator. Display: large and easy-to-read LCD screen includes simultaneous temperature reading. Factory calibrated with three-point calibration to 4, 7 and 10 pH. The meter can be recalibrated with digital calibration using the push buttons, no screwdriver needed. 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For best results, use the KCl solution to store the pH pen\/probe after use and hydrate monthly. 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We have combined the Bluelab¬¨√Ü Multimedia pH Meter and Bluelab¬¨√Ü Leap‚Äö√묢 pH Probe to take fast, accurate measurements in nutrient solution, soil, coco coir, rockwool, potting mix and many other media types. Calibration is simple with one push button on the meter and fresh Bluelab¬¨√Ü Calibration Solutions. Successful calibration indicator is displayed on screen for 30 days to indicate when re-calibration is required. The Bluelab¬¨√Ü Leap‚Äö√묢 pH Probe is suitable for use with all Bluelab¬¨√Ü products that use a BNC connection. Team with the Bluelab¬¨√Ü Solutions and the convenient Bluelab¬¨√Ü Carry Case (#716440). 2 m \/ 6.6 ft standard cable included.\u003c\/p\u003e","brand":"Bluelab","offers":[{"title":"Default Title","offer_id":58449955782959,"sku":"400000037646","price":123.07,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0978\/4875\/4479\/files\/HGC716446-01.jpg?v=1789071374"},{"product_id":"bluelab-truncheon","title":"Bluelab Truncheon","description":"\u003cp\u003eWith its super tough, high-quality, fully waterproof design, no calibration required, daylight readable blue LEDs and no on\/off buttons to worry about, the Bluelab Truncheon Nutrient Meter has proven itself as the world's favorite nutrient meter. It is powered by three standard AA batteries. EC (02-3.6), CF (2-36) and ppm scales (TDS and 700 scale). Fully waterproof design. No calibration required. Auto sense on and off. No external switches or adjustable buttons. 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