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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.


Infrared Window,6221 sq. mm,IP67,SS FLIR IRW-4S picture
Infrared Window,6221 sq. mm,IP67,SS FLIR IRW-4S
$453.29

Freestanding Electric Hygrometer Stainless Steel 2.5 cu.ft Cigar Cooler Humidor picture
Freestanding Electric Hygrometer Stainless Steel 2.5 cu.ft Cigar Cooler Humidor
$442.89

Grow Tent+Grow Light Hanger+Digital Hygrometer+Shears+24 Hour Timer+Trellis Net picture
Grow Tent+Grow Light Hanger+Digital Hygrometer+Shears+24 Hour Timer+Trellis Net
$418.21

Temp/Humdty Mtr,5 to 95 per Rel Hum Rnge EXTECH SDL500 picture
Temp/Humdty Mtr,5 to 95 per Rel Hum Rnge EXTECH SDL500
$409.99

Round Infrared Window,95mm dia,Type 3/12 FLIR IRW-4C picture
Round Infrared Window,95mm dia,Type 3/12 FLIR IRW-4C
$399.99

WHYNTER 2.5 cu ft Cigar Cooler Humidor Storage Stainless Steel Analog Hygrometer picture
WHYNTER 2.5 cu ft Cigar Cooler Humidor Storage Stainless Steel Analog Hygrometer
$390.0

Bosch GIS 1000C Thermo Detector Infrared Scanner Imaging Thermometer/hygrometer picture
Bosch GIS 1000C Thermo Detector Infrared Scanner Imaging Thermometer/hygrometer
$389.99

Wireless Humidity Sensor,1
Wireless Humidity Sensor,1" H,900 MHz RF NOTIFEYE 15220
$389.86

Delmhorst HT-3000 Thermo-hygrometer picture
Delmhorst HT-3000 Thermo-hygrometer
$388.47

Cigar Cooler Humidor Stainless Steel 2.5 cu. ft.Freestanding Electric Hygrometer picture
Cigar Cooler Humidor Stainless Steel 2.5 cu. ft.Freestanding Electric Hygrometer
$367.23

Thermometer,-328 to 932 deg. F,USB CONTROL COMPANY 6412 picture
Thermometer,-328 to 932 deg. F,USB CONTROL COMPANY 6412
$361.14

Thermometer,-148 to 392 deg. F,USB CONTROL COMPANY 6413 picture
Thermometer,-148 to 392 deg. F,USB CONTROL COMPANY 6413
$352.29

Grow Tent+Grow Light Hanger+Digital Hygrometer+Shears+24 Hour Timer+Trellis Net picture
Grow Tent+Grow Light Hanger+Digital Hygrometer+Shears+24 Hour Timer+Trellis Net
$352.0

Thermocouple Thermometer,4 Input EXTECH SDL200 picture
Thermocouple Thermometer,4 Input EXTECH SDL200
$349.99

Delmhorst HT-3000 Thermo-hygrometer picture
Delmhorst HT-3000 Thermo-hygrometer
$340.0

Brass Tide Clock and  Brass Thermometer Hygrometer on Stand picture
Brass Tide Clock and Brass Thermometer Hygrometer on Stand
$339.99

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