Hey guys and girls! Well I've been doing a lot of research and I've been building my own little database of how to grow in tropics seeing as there's so little information on the web regarding tropical climate growing. What little is out there I'm finding it's kinda hit and miss. Anyway since VPD has been part of my research I thought I would share this excel sheet I found doing some random googling. I've found it helps calculating my VPD along with a cheap laser thermometer. If you have one just point it at the plant (it's usually 1-2 C cooler than the ambient temp. At the upper right of the excel sheet just replace the red Air temp, Leaf Temp and RH with your readings and it'll tell you your VPD easy! This is especially handy if you don't grow in northern climates (like me). Here's the excel file link.