Will I need anything else for this incubator like a thermostat, etc?
http://lllreptile.com/store/catalog/reptile-supplies/reptile-incubators/-/thermal-hova-bator-incubator1602n/
That incubator is good value and relatively highly regarded by herpers, but as you've noticed, it's lacking in the control department.
Basically you set the desired temperature using a dial that controls a wafer "thermostat" but there is no feedback, so as the temperature varies in the room, so does the incubator temperature (although there's a fairly large lag, due to the insulating property of the Styrofoam.)
If you plan to keep the incubator in an environment that stays a pretty constant temperature, and are planning to be around a lot to keep a check on the temperature reading on the thermometer that you keep inside the incubator, and you're happy to make manual adjustments if/when required, it'll be fine.
If not then yes, you should control the temperature thermostatically.
For what it's worth, I use that type of incubator for my poultry, but a far more accurate, home made one for our tortoises - as described here: http://answers.yahoo.com/question/index;_ylt=AtSMFp08YeUgHHqf4Jr719bty6IX;_ylv=3?qid=20090211091716AApZCAL
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