I did way WAY to much research on this topic purchase. I landed on the Etekcity from the link below. The dual laser is awesome because the beams converge at the optimal distance. You can hold the trigger and it takes a continuous reading, which is great cause I just keep it pressed and move it around the whole tub to see all the different temps. Then once I let go of the trigger it shows the last reading and the max reading (this comes in real handy for taking readings in tubs up high where I can't see the screen). It has a 12:1 spot ratio. All this for $30 delivered. Very accurate. Hope this helps
http://www.amazon.com/dp/B00F8OPKOO
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