Rings water baths are identical for all applications requiring gentle steaming work with Erlenmeyer flasks, glasses, etc.SPECIFICATIONS:Construction: Double walledInner and Outer: Made of 304-grade stainless steel.With chamber drain nozzle at the bottom.  Temperature Control: By thermostatic control. Insulation: The gap between the inner and outer chamber is filled with glass wool insulation.  7.5 cm diameter concentric rings. Temperature Range: 5C above ambient to 95C with an accuracy of +/- 2C.  Power Supply: 230 Volts 50 Hz single phase AC supply.No. of Holes: 6 No. of Holes: 12Temperature Controller: Instead of thermostatic Control by Microprocessor based PID temperature controller with dual display(Process value and set value), low and high limit settings with PT 100 Sensor