I use a Blue Planet Energy Meter purchased from Canadian Tire for about $20.00 to monitor the electrical load placed on a circuit and estimate the monthly cost incurred by an electrical item. 
 
I originally bought it to monitor the electrical draw of my MH lights on a circuit as I was always concerned about over loading the circuit. We have all seen the the back of peoples tanks with 8 or 10 items plugged into a single wall circuit. 
 
These thinks are really handy for the price. 
 
Tom R 
		
	
		
		
		
		
			
		
		
		
		
	
		
		
	
	
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