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Hydroponic Hygrometer

Hydroponic System DiagramTo ensure that your plants are being fed the proper nutrients and nutrient concentrations, it is important to monitor your nutrient solution.

On a daily basis you should test the nutrient solution and record the results

  • EC (Nutrient concentrations)
  • PH (acidity / alkalinity...see Lesson 4 for more information on PH)
  • Temperature of nutrient solution
  • Daytime room temperature
  • Nighttime room temperature

It is also important to record when you replace your nutrient solution so you can easily determine when it should again be replaced.

In addition to these tests, you may also want to record the stage of plant growth, the size of your plants and any problems or significant changes.

Recording this information gives you an accurate accounting of what is happening with your plants. This data is an excellent tool for diagnosing problems, should they arise.

Advanced Nutrient Testing
Neither an EC or TDS meter can indicate precisely what nutrients make up the fertilizer solution. More complete test kits are available for this purpose. Many commercial growers test their nutrient solutions on a regular basis to ensure they are feeding exactly the mix that is intended. Regular leaf analysis is an excellent tool for determining the health of your plants. Leaf tissue samples are dried, crushed and analyzed to determine the exact nutrient content.

Most of the more complex kits will test nitrogen, potassium, phosphorous and sulfur. Commercial labs offer more precise results. In the event of a combination of nutrient deficiencies, the symptoms of one problem may mask the symptoms of another. A leaf tissue analysis may be the only way to determine what is wrong with your plants.

Listed below are some testing devices to get started with.


New Howard Miller Olympia 612-721 Thermometer Barometer Hygrometer picture
New Howard Miller Olympia 612-721 Thermometer Barometer Hygrometer
$700.0

Howard Miller Olympia Thermometer, Barometer & Hygrometer 612-721 picture
Howard Miller Olympia Thermometer, Barometer & Hygrometer 612-721
$600.95

Protimeter Psyclone Thermo-Hygrometer picture
Protimeter Psyclone Thermo-Hygrometer
$485.8

SAUNA LIGHT CARIITTI TERMOMETER / HYGROMETER / SAND TIMER picture
SAUNA LIGHT CARIITTI TERMOMETER / HYGROMETER / SAND TIMER
$415.0

Howard Miller Catalina Thermometer, Clock, Barometer & Hygrometer 612-718 picture
Howard Miller Catalina Thermometer, Clock, Barometer & Hygrometer 612-718
$406.45

400221 Extech Instruments’ RH490 Precision Hygrometer picture
400221 Extech Instruments’ RH490 Precision Hygrometer
$375.95

 Extech Instruments’ RH490 Precision Hygrometer picture
Extech Instruments’ RH490 Precision Hygrometer
$300.0

400221 Extech Instruments’ RH490 Precision Hygrometer picture
400221 Extech Instruments’ RH490 Precision Hygrometer
$299.9

SAUNA LIGHT CARIITTI TERMO HYGROMETER picture
SAUNA LIGHT CARIITTI TERMO HYGROMETER
$270.0

TYLÖ THERMO-HYGROMETER & SANDWATCH picture
TYLÖ THERMO-HYGROMETER & SANDWATCH
$245.0

TFA Weather Station Sputnik for indoor use, barometer, thermometer, hygrometer picture
TFA Weather Station Sputnik for indoor use, barometer, thermometer, hygrometer
$242.94

Meter Vane Anemometer Thermometer Light Hygrometer Flow Davm Digital Metersupco picture
Meter Vane Anemometer Thermometer Light Hygrometer Flow Davm Digital Metersupco
$241.47

Comfort Minder Black & Nickel Hygrometer [ID 1624011] picture
Comfort Minder Black & Nickel Hygrometer [ID 1624011]
$233.61

Degree Point Traceable Hygrometer Thermometer Barometer Rhthomas Thomas Mmhg picture
Degree Point Traceable Hygrometer Thermometer Barometer Rhthomas Thomas Mmhg
$232.44

Bey-Berk Wall Clock with Barometer, Thermometer and Hygrometer picture
Bey-Berk Wall Clock with Barometer, Thermometer and Hygrometer
$214.99

Bey-Berk Wall Clock with Barometer, Thermometer and Hygrometer picture
Bey-Berk Wall Clock with Barometer, Thermometer and Hygrometer
$214.99

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