Hydroponics as Hobby? You need HM Digital COM-100 Meter

When you practice hydroponics as hobby, you will need the proper tool measure EC and TDS temp. HM Digital COM-100 Meter is a waterproof meter to help you measure EC to keep it from burning your plants. This little tool is also pretty handy to test water quality for different purposes such as wastewater regulation, scientific testing, water purification or maybe colloidal silver. Although this meter seems to feature many calibration options (KCI, 442TM, NaCl), you might not need to read the instructions as the result is pretty straightforward and easy to use. Dip it in the water, it gives you instant reading.

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