BlueLab Calibration Solution - 27.7CF/EC2.77 - 250mL Sitewide Application Guide:

Application Guide:

but for hydroponic systems

with no visible residue

Growers typically hold the meter at canopy height during a slow walk-through

Robust Construction:

BlueLab Calibration Solution - 27.7CF/EC2.77 - 250mL Sitewide Application Guide:Calibration solution for Truncheon, Guardian (conductivity), and ppm EC pen. 2. 77 EC = 1350 TDS ppm (500 scale) = 1890 ppm (700 ppm) The 2. 77EC Conductivity solution is used as a reference or checking solution to ensure you have adequately cleaned the EC CF probe. These solutions should be stored in a cool place out of direct sun and heat. Please keep out of reach of children. They should be stored with the lids securely tightened.