A useful hydroponics calculator to help your hydroponic grow. Includes calculators for grow light wattage, grow light energy costs, EC or PPM conductivity, temperature conversion, air exchange, and a carbon dioxide calculator to see how much co2 your garden needs.
Need to know how long you take to reply to EMails, be reminded to when change the CO2 filter or run a program every 3 hours? Secs is an easy to use timer, capable of counting up as well as down, and settable by second divisions from 1 second up to almost 50 days. It can have a beep or almost any standard audio file (including MP3s) for the "time-up" sound, either of which can be set to repeat, plus it can also run files.
