Description pH calibration solution, otherwise known as pH buffer is an essential tool for all hydroponic growers. Calibrating your pH pen regularly goes a long way in ensuring your readings are accurate and reliable. Get all you pH solutions in one kit. We've bundled everything you need for calibratong your pH pen and keeping them clean and stored in one simple kit. Kit consists of: GT pH Probe Storage 250mL GT pH Buffer 7 250mL GT pH Buffer 4 250mL GT pH Probe Cleaner 250mL 2x Measuring Cups 60mL
