Leap pH Probe (Soil & Water) 12" but if you've got their

but if you've got their SE-based 600W unit

but easy to mix and use

#2 plastic (HDPE - the good stuff

If your tap water is over 200 ppm (or contains Calcium above 70 ppm)

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Leap pH Probe (Soil & Water) 12" but if you've got theirThe perfect, portable way to accurately measure and monitor pH levels in a wide range of media. Use this Bluelab Leap pH probe to take fast accurate measurements in a nutrient solution, soil, coco coir, rockwool, potting mix, and many other media types. Calibration is simple with one push button on the meter and fresh bluelab calibration solutions. Successful calibration indicator is displayed on screen for 30 days to indicate when re calibration is