General Hydroponics pH 7.0 Calibration Solution is easy to use! Just dip your electrode into a small amount of the buffer and adjust the meter to read 7.0. Do not reuse solution.
General Hydroponics reference solutions are of the highest quality, allowing growers to calibrate many popular brands of pH, EC and TDS meters (NaCl scale or the 442 scale). Each batch is checked carefully to ensure that these solutions are precisely calibrated and yield reliable readings each time they are used.
When getting started, it’s a good idea to measure the pH of your water everyday, until you get a feel for it. Measure your water and then add the nutrients. Within an hour check the pH and adjust accordingly. Repeat this process until pH stabilizes. After several runs you can generally get a feel for how much pH Up or pH Down to use.