what you need is a digital thermometer\hygrometer to measure the temperature and relative humidity of the air in your grow room, most will give you both the high and low values as well, over a period of time.

you also need a thermometer for your reservoir and you can find that in the pet department of Walmart, look for fish stuff
also a good place to get air pumps, stones and lines and fittings if you're growing in hydro
justanotherbozo Reviewed by justanotherbozo on . Digital Thermometer Question? I was a Walgreens and was looking at the digi's and i asked the lady which would be the best for measuring liquids(i think she knew what i was up to, marijuana causes paranoia) and she said none there would work... The ones that you stick in your mouth when your sick wouldnt work? they even said waterproof? does it even matter which one i choose? if killerweed420 or IamN2Pot sees this you guys fucking rock! bought quick fix today by spectrum labs and cant wait to use it. :jointsmile: Rating: 5