The Water Separability / Demulsibility Apparatus, compliant with ASTM D 1401 and ISO 6614, offers precise water separability testing for petroleum oils and synthetic fluids. This six-place device features an electric lifting mechanism, digital tachometer, adjustable speed electric stirrer, and an electronic temperature controller with safety alarms. The separate control box prevents overheating, enhancing durability. Key components include a borosilicate glass jar, anodized aluminum cover with a six-position turntable, electric lift, stainless steel heater, and coaxial CC motor stirrer. Additional features include a digital timer, LED lighting, microprocessor-controlled thermoregulator, and accurate safety devices, ensuring reliable and precise measurements from ambient to 100°C.