Water bath temperature is monitored and controlled over the entire range with an accuracy of ±0.1ºC with P.I.D temperature controller. Easy-to-read LCD digital display provides a user-friendly interface which helps minimize errors in establishing running conditions. Non-volatile memory retains preset parameters during a power failure and restarts unit automatically after the power is restored. Heat loss and evaporation is minimized with the use of finely electro-polished stainless steel gabled lid cover.(Standard on ZWY-series units, without lid for ZWYK series units) High quality #304 stainless steel for excellent durability of interiors and its parts. Standard stainless steel tray, without clamps.