The ESSENTIALS EC Meter gives users accurate readings of a nutrient solution. It is by all means an essential piece of equipment for hydroponics or soilless systems. All readings are automatically temperature compensated. General Information This EC Meter has a lifespan of approximately 1-3 years depending on rate of sampling. If the meter is dropped into your solution, it will float to the top so you can quickly get it out before the internal components are damaged. Benefits Long lasting Provides accurate readings Easy to calibrate How to Use Simply dip the sensor in the solution, stir and wait for the beep. Readings are typically provided within 20 seconds.