no i have one of those exact ones in my 32 too and honestly its a piece of crap compared to my jagers. it is way over what i need to heat it and i had to turn it all the way up to get it to 86 lol. you are right that it doesnt have any calibration though. i ordered two 150 watt ebo jagers off of ebay for 15 bucks a piece and they are working like a charm. they took forever to find but look around you should find somthing if you are looking for a new one.
^^^Most heater thermostat dials are way off. My 300watt jagers are pretty close , but as stated earlier, those little digital thermometers(coralife, etc) are really innaccurate. Ive have three and they all read differently. Id make sure youre getting a good reading, then adjust your dials to compensate for whatever the difference may be. I had an aqueon i had to set at about 70 for it to heat to 80-82 degrees. lol it has since been replaced