... life, reduce the failure rate.standard GB/T2423.1-2001 GB/T2423.2-2001 Constant temperature and humidity chamber' ... °CTemperature performanceVolatility ≤ ± 0.5 °C, uniformity ≤ 2 °CHumidity Range20%R.H,30%R.H~98%R.HHumidity ... PerformanceVolatility ≤ ± 1 ~ 2% R. H, uniformity ≤ 3 ~ 4% R. HCooling ... , Φ50mm standard lead holesStandardGB2423.1,GB2423.2, GB/T2423.3,GB10586,GB10589