GroStar by Apera EC Calibration Kit (2.77 EC, 8 oz. each) • 2.77 EC conductivity standard calibration solution• Used as a reference or checking solution to ensure you have adequately...

AI11010 - GroStar GS1 pH PenLab grade instruments designed specifically for growers!Includes: • 2-year warranty (instrument)• 1-year warranty (probe)• pH 7 & pH4 calibration solution (50ml...

AI58010 - GroStar GS1-E replacement pH electrode • Replacement GS1 probe measures pH and temperature• Premium probe technologies and materials ensure high accuracy and durability with...

AI31020 - GroStar GS2 Soil pH PenLab grade instruments designed specifically for growers!Includes: • 2-year warranty (instrument)• 1-year warranty (probe)• pH 7 & pH 4 solution (50ml bottles...

AI58020 - GroStar GS2-E replacement Soil Spear pH electrode • Spear pH Probe measures pH and temperature in nutrient solution, soil, coco coir, rockwool, and many other media...

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 calibration solution, 50...

AI58030 - GroStar GS3-E replacement EC electrode • Measures conductivity EC, PPM (500), PPM (700) and temperature• Premium probe technologies and materials ensure high accuracy and...

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 warranty (probe)•...

AI58040 - GroStar GS4-E replacement pH/EC combo electrode • Measures pH, conductivity (EC and PPM) and temperature• Combo probe built with lithium glass membrane and titanium alloy to...

GroStar 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  pH measuring equipment must be...

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 calibration solution 8 oz. (1) pH 10.0 calibration solution 8 oz. pH...

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 (8oz...