CF-B constant temperature water bath with digital display is used for heating and maintaining a constant temperature for varieties of samples. It offers standard samples with constant temperature for Marshall stability test for asphalt concrete, with functions of accurate temperature control, heating and maintaining a constant temperature and etc. Technical parameters: 1.Voltage:220V±10% 2.Heating power:1000W 3. Control of temperature: Normal temperature--100 4.Accuracy:±<0.1,<0.5 two types 5.Internal dimension:470x310x330mm