The electrical conductivity (EC) in organics has little to say about the contained nutrients, cause organic nutrients are often in a form that need to be made available to the plant by soil bacteria or root exsudates. As such, these nutrients are not detected by the EC meter. In this case the EC was 0.9 which tells you that there is a little amount of dissolved ions (maybe plant nutrients, maybe not) but it tells you nothing about the bound nutrients that will be released in the future. However, if your organic solution has a high EC, for example 4 dS m-1, it does tell you that the EC is too high due to dissolved ions and it will harm your plants if you feed them this.
Another thing is that in general the EC does not tell you anything about the nature of the dissolved ions. You could take RO water and dissole NaCl in it and the EC would rise, but there are no plant nutrients in that solution. So EC only tells you sth about the nutrient content when you know which salts you dissolve in the water and in which proportions, or in case of organic solutions, if you have access to a lab to test the composition of the solution. If not, EC tells you only that the solution has dissolved ions and if too high it reduce the osmotic potential of the soil leading to a number of problems.