Maple leaf Indica : This strain is best used for treating different kinds of depression, stress and anxiety. It relieves the symptoms of these problems and makes you feel calm and peaceful. It is also employed for treating nausea, different types of mild and chronic pain as well as insomnia.
stick the probe all the way into the ground , you want to test the soil at the same level than the root ball.
some god "how to" available here : http://www.matilijanursery.com/articles/how-to-water-get-a-moisture-meter/
I think the problem is overwatering. How heavy is your grow pot? Drooping / Curling is the first sign of overwaterd marijuana plants. Plants start drooping after watering. Will eventually lead to leaf yellowing and other signs of nutrient problems if not corrected.
http://www.apc.com/products/resource/include/techspec_index.cfm?base_sku=SRT8KXLT&total_watts=200&ISOCountryCode=ca&gclid=CPemlN7T68gCFRCpaQodWsMDOg
pretty expensive, but if you can afford it, it's the best thing you can have and you can plug it to a generator, it will stabilise the power
I would use a trail cam to find who did this
http://www.amazon.ca/s/?ie=UTF8&keywords=trail+cams&tag=googcana-20&index=aps&hvadid=33481088386&hvpos=1t2&hvexid=&hvnetw=s&hvrand=1760614007030314215&hvpone=&hvptwo=&hvqmt=b&hvdev=c&ref=pd_sl_5nwee8el5x_b