TDS Monitor for Phalaenopsis Orchid Care

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Fertilizer is the least important aspect of orchid growing. In importance to other factors its importance is less than 1%.

Assuming the total dissolved solids meter is accurate - a HUGE assumption for a cheap one - they only tell you how many charged particles exist in a solution. They don't tell you what those charged particles are in the solution. The only time they are useful is when mixing enourmous batches of fertilizer and you've preciously measured the TDS of a known mixture of that fertilizer in that water.

It's simpler to use a fertilizer calculator and pay attention to nitrogen. You can learn a lot about fertilizer at firstrays.com where you will find a nitrogen calculator.

Edit: I wrote "monitoring" to refer to repeatedly checking TDS. Knowing the TDS of water used is important but it's not important to monitor it repeatedly,