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GroStar™
GroStar™ Premium Pen Testers are designed specifically for the horticultural market.
About GrowStar
GroStar™ Premium Pen Testers are designed specifically for the horticultural market. GroStar’s intelligent design reduces the guesswork so you can easily manage your crops success.
30 Years of Expertise
We have been focused on the design, development, and manufacture of electrochemical sensors and instruments since 1991. The experience and technologies we’ve been accumulating over the years in this specific industry are the foundation of the reliability of our products.
Industry-leading Warranty
Each and every key component of our products is made in-house so we have the total confidence and control on the quality. All of our instruments come with at least a Two-Year limited warranty (Six-Month for electrodes).
Our Mission is Your Satisfaction
We understand that getting reliable water test results could be challenging sometimes. Our customer support specialists stand ready to help you solve any problems you might experience in the process.
We Provide the Best Value
We believe that monitoring water quality in a reliable and easy way shouldn’t be a luxury. While we ensure every single Apera product comes with the best quality, we also work hard to give you the right tool with the best value.
Our Products
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GroStar GS1 pH Pen
AI11010 - GroStar GS1 pH PenLab grade instruments designed specifically for growers!Includes: • 2-year warranty (instrument)• 1-year warranty (probe)• pH 7 ...
$83.97
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GroStar GS3 EC Pen
AI11030 - GroStar GS3 EC/PPM/Temp PenLab grade instruments designed specifically for growers!Includes: • 2-year warranty (instrument)• 1-year warranty (probe)• 2.77 EC ...
$78.90
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GroStar GS4 pH/EC/500ppm/700ppm/Temp (5-in-1) Combo Pen
AI21040 - GroStar GS4 pH/EC/500ppm/700ppm & Temp (5-in-1) Combo PenLab grade instruments designed specifically for growers!Includes: • 2-year warranty (instrument)• 1-year ...
$123.89
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GroStar GS2 Soil pH Pen
AI31020 - GroStar GS2 Soil pH PenLab grade instruments designed specifically for growers!Includes: • 2-year warranty (instrument)• 1-year warranty (probe)• pH ...
$177.87
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GroStar GS1-E replacement pH electrode
AI58010 - GroStar GS1-E replacement pH electrode • Replacement GS1 probe measures pH and temperature• Premium probe technologies and materials ensure high accuracy ...
$35.29
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GroStar GS2-E replacement Soil Spear pH electrode
AI58020 - GroStar GS2-E replacement Soil Spear pH electrode • Spear pH Probe measures pH and temperature in nutrient solution, soil, coco ...
$125.96
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GroStar GS3-E replacement EC electrode
AI58030 - GroStar GS3-E replacement EC electrode • Measures conductivity EC, PPM (500), PPM (700) and temperature• Premium probe technologies and materials ensure ...
$37.37
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GroStar GS4-E replacement pH/EC combo electrode
AI58040 - GroStar GS4-E replacement pH/EC combo electrode • Measures pH, conductivity (EC and PPM) and temperature• Combo probe built with lithium glass ...
$55.36
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GroStar pH calibration kit (pH 4/7, 8 oz. each)
GroStar by Apera pH calibration kit (pH 4/7, 8 oz. each) Kit includes: (1) 8 oz. pH 4.0 calibration solution (1) 8 ...
$13.14
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GroStar pH calibration kit (pH 4/7/10, 8 oz. each)
GroStar by Apera pH calibration kit (pH 4/7/10, 8 oz. each) Kit Includes: (1) pH 4.0 calibration solution 8 oz. (1) pH 7.0 ...
$20.06
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GroStar pH Probe Maintanence Kit
All-in-one maintanence kit provides everything you need to maintain, clean and store your GroStar pH probe Kit Includes: 3M KCL storage solution (4oz.) Cleaning solution ...
$16.60
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GroStar EC Calibration Kit (2.77 EC, 8 oz. each)
GroStar by Apera EC Calibration Kit (2.77 EC, 8 oz. each) • 2.77 EC conductivity standard calibration solution• Used as a reference or ...
$10.37
