Heh, I see some people say this pH meter is garbage. Well, that’s wrong statement. Such pH meters are pretty accurate IF they are calibrated properly and sensor is stored in pH 7 solution. Never let the sensor dry out and never use distilled/ro water for storing. Such water can only be used to rinse the sensor after each use. Then add enough pH 7 or 6.86 calibration solution into the cap to soak the sensor completely, and close it. You’ll see, this method keeps your meter alive and precise for a long time. You really need some good amount of pH 4.01, 6.86, 9.13 calibration solutions or powders to keep the sensor working.
EC meter doesn’t require any special care except rinse in distilled water after each use and shaking off/blowing compressed air to make it dry. Good luck.