• 50ppm 442TDS
• Capacity (mL): 480
• *Expiration date: 3 years after manufacture
• Model number: EC44250BT
• Calibration solution BT is high purity type that has been pre-formulated.
• Calibration solution BX is tablet type to use is dissolved in pure water or distilled water 30ml.
• Calibration solution BS is high purity type went into 20ml pack of pouch type
