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Reference thermometer recommendation

Does anyone have a recommendation for a reasonably priced thermometer and/or thermo-hygrometer?  I have so many temp sensors in the house that all report something slightly different it would be good to put a reliable thermometer at the location for a while and then adjust the reported temp on these devices to read something consistent.  Thanks.


My 1-Wire temperature sensors are pretty accurate here.  Been using these for years now. 
Recently (years) switched over from the old serial Midon TempXX stuff to using a firmware modded SonOff basic with up to 5 1-Wire temperature sensors connected.
In addition here utilize HAI Omnistat, HAI temperature (indoors and outdoors) and HAI combo sensors.
The above said you can purchase a combo portable sensor with LCD console (which is accurate) for less than $20 these days.