The water triple point bottle is an internationally recognized standard for reproducing 0.01 ℃ in the metrological verification of standard platinum resistance thermometers. The water triple point bottle is mainly a glass container containing high-purity water under a pressure of 610.75Pa, achieving a temperature of 0.01 ℃ with an expanded uncertainty of less than 0.0004 ℃.

YH-196 Ultra low temperature thermostatic bath is an ultra low temperature refrigeration and constant temperature device using liquid nitrogen as the cold source. It has a temperature field of -196 ℃, which is beyond the reach of conventional mechanical refrigeration and is suitable for the use of sensors such as rods. High precision digital temperature control instrument control has the characteristics of compact structure, easy operation, and intuitive slot temperature reading. The device adopts an automatic liquid nitrogen pumping function, which eliminates the need for manual liquid nitrogen addition and avoids the splashing of liquid nitrogen caused by manual addition. This enhances safety and reliability, greatly reducing the loss of liquid nitrogen.