Sometimes though, if a grower is planning to use a big pot later, they use the Maxis in the small pot too instead of needing to get both small and large Blumat sensors. This works in most places but in very dry climates (like we have here in Colorado), if too much of the sensor is above the soil level, it can evaporate water out and create air bubbles that slow or even stop the Blumat from working.
Horizontal. If you put a Maxi horizontal instead of vertical in a pot so it senses just under the root ball, you can use less Blumats than are normally recommended. (See our instruction flyer on using Maxi Longs.)