Some thermostats have a 4º+/- accuracy some thermometers have a 4ºF +/- accuracy. Accurite having some models that are rated to 4ºF accuracy. It is quite possible to have a T-stat that is three degrees low and a thermometer that is 3 degrees high generating the 6º discrepancy. This depends on the specs of the particular units being used. Many suggest hydrofarm T-stats but I personally do not, due to the error they can have same for accurite thermometers. The best suggestion is to buy either a better thermometer or multiple poor ones and check them against each other and do not use the ones reading high or low of the 'pack' The more you have the better the theoretical accuracy you get (law of averages) you need at least 3 but 5 would be much better. With this in mind I suggest the cheapest you can find. I typically pay between 1-4$ each with shipping so it is easy to have quite a number. Good units that have a high degree of accuracy 0.5ºF or better and are certified correct cost serious bucks so few decide to go this route. The best IR guns I have ever encountered are 1.8ºF up or down they are great tools but not highly accurate.
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