Difference between Level 1 and Level 2 Control Solution
У вашего броузера проблема в совместимости с HTML5
Explain the difference between level 1 and level 2 control solutions. Explain what control solution is and the purpose.
Also discuss the difference between levels and ranges. Explain why control solution does not calibrate the meter.
Help determine when you may want to use control solution and then show some examples.