everybody keeps talking about these digital thermometer/hygrometer and they found them at wal mart would you please tell in what department or where else they have been found i asked everybody at walmart and they said the only thing they have is thermometers with probes no hygrometers so please help my other gauges i feel are not that accurate and my bps just a bad shed so i built the do it yourself humidifier from this site and now i need the gauge to be accurate thanks