I recently purchased red sea test. It works different than the elos i have been using for years. My question is the final step. It says you read the number on the syringe when vial turns blue. Using the chart it tells you the mag level. My mag level keeps reading way low. The top of the chart says amount of solution used not amount remaining. The number on the syringe shows how much is remaining not how much was used. It has 1.0 ml toward plunger which is how much is left not 1.0 ml at tip which would be how much you used.