Bluelab Hydroponics Nutrient Solution Electrical Conductivity Meter.

Measure and adjust the amount of nutrients available in your nutritious solution to ensure your plants are getting adequate amounts of macronutrients and micronutrients for optimal healthy growth.
Measuring the electrical conductivity is the easiest way to keep track of the total amount of nutritional ionic dissolved salts available in solution. In scientific words, when soluble nutrients are added to water, they dissolve to form ions; some have positive charges and others carry negative charges, this creates a potential for electricity to move through the enriched water, increasing its electrical conductivity.

Product specifications:

• Every conductivity scale is included: EC, CF, TDS PPM 500 and PPM 700.
• Measure up to 3.6 EC, 36 CF, 1800 ppm 500 and 2520 ppm 700.
• Operating environment: 0°C to 50°C or 32°F to 122°F.
• Measurement resolution: 0.1 EC, 1 CF, 50 ppm 500 (TDS), 70 ppm 700 (ppm x 700).
• Measurement range: 0.2 to 3.6 EC, 2 to 36 CF, 100 to 1800 ppm 500 (TDS), 140 to 2520 ppm (ppm 700).
• Measurement accuracy: ± 0.1 EC, ± 1 CF, ± 50 ppm (1385 ppm at 500 ppm), ± 70 ppm (1939 ppm at 700 ppm).
• Automatically detects liquids for simple functionality.
• Bright LEDs indicate measured values.
• Long format design to allow mixing and measuring simultaneously in nutrient solution reservoirs.
• No calibration required.
• Automatic temperature compensation.
• Fully waterproof; splash, submerge or sink in solution.
• Tough and robust construction designed for long lasting reliability, withstands the knocks and drops that come with everyday growing.
• Easy to clean and disinfect.
  
• Power source: 3 x AAA alkaline batteries.
• CE, FCC and RoHS compliant.
• Designed and assembled in New Zealand. Built for growers.