Apera Instruments
Apera Instruments provides scientific electrochemical instruments and sensors for measuring pH, ORP, conductivity, TDS, salinity, dissolved oxygen, turbidity, and ISE with our industry-leading technologies, quality control system, and customer service. They are really good pH, EC and combo meters A-Grade Hydroponics highly recommends them over other brands. Their Customer service is unparalleled. If you're using a hydroponics system or an aquaponics system these pens and meters will come in handy when measuring your hydroponic nutrient tank they are very accurate and you can trust them.
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