EC Pen Calibration Fluid
Conductivity standard for use in calibrating all types of nutrient meters and useful for checking the Bluelab Truncheons, though you cannot calibrate the truncheon as such it can lose accuracy when it needs a clean or resetting..
Two levels of conductivity are available, 1.41 (microSiemens/cm) and 2.76. Both come in 300ml bottles
Calibration of all measuring equipment should be performed weekly to ensure accuracy with critical nutrient solution measurements.