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Grow your plants successfully with Bluelab meters from 1000Bulbs.com. These meters accurately measure pH, temperature and conductivity, so you can see better results in your indoor or outdoor garden. Choose the waterproof pH pen to monitor the pH levels and adjust when necessary, and keep track of temperature, read in both Celsius and Fahrenheit. If you want to ensure your plants have all of the essential nutrients they need, use the ppm pen, which measures conductivity on the ppm 500 and 700 scales. We also offer a replacement pH probe, which is compatible with Bluelab's pH meters. At 1000Bulbs.com, we want to make sure you have all of the right tools to enjoy the best possible outcome.