Precision constant temperature 109L programmable water bath. Extremely high degree of temperature adjustment precision achieved by adopting high-precision thermostat and circulation pump. Controller with program operation function (1 pattern 30 steps or 2 pattern 15 steps). Digital display setting and indicated value of temperature and time. Equipped with observation window. Optional items include cooling coil, top cover, mounting rack, and viscosity meter support. Temperature range: ambient +5~80 C.