You can already find in Piensa en Verde this 12-membrane ultrasonic humidifier, an ideal appliance to increase humidity in large indoor crops.
This humidifier works only though you can also put it inside the Ocean to complement it, increase the amount of steam and you can direct it where it suits you. Although at first glance it may seem an expensive product nothing further from reality, there are 12 membrane humidifiers that are worth twice as much and produce the same amount of steam, its simplicity and size combine perfectly with its effectiveness.
You will also find 12 replacement membranes to replace when you see that one isn't working properly. If you need to raise the relative humidity in your greenhouse and you are looking for a device with the best guarantees, the 12 membranes humidifier will be your purchase of the month.
Important: I recommend you use it with rainwater, air conditioning or osmosis, if you use tap water you will reduce its durability due to lime and salts.