Aqua Master EC1413 Calibration Solution Compatible with all Aqua Master EC Pens.Ensure precise measurements with this essential calibration solution for Aqua Master EC Pens.This EC1413 solution helps maintain the accuracy of your conductivity meter, guaranteeing reliable readings for your water quality tests.Compatible with all Aqua Master EC Pens, this solution is a must-have for hobbyists, professionals, and anyone seeking to maintain optimal water conditions. Key features:- 1413 μS/cm (microSiemens per centimeter) conductivity standard- 20ml convenient size for multiple calibrations- Ensures accuracy of Aqua Master EC Pens- Easy to use for quick and reliable calibration Close immediately after use. Store between 15-25 °C. Do not return liquid. Temp. (°C) µS/cm 15 1147 20 1278 21 1305 22 1332 23 1359 24 1386 25 1413 26 1440 27 1467 28 1494 29 1521 30 1548