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1. After unboxing the automatic freezing point and pour point tester, first conduct an external inspection. After placing it at room temperature for more than 8 hours, check whether all switches are in good condition and set them to the off position. 2. Check whether there is a protective ground wire in the mains socket; if not, the instrument should be connected to a proper protective ground wire to prevent electric leakage from posing a risk to human safety. (Note! To ensure personal safety, the wiring of power sockets should comply with **standard specifications: the middle hole is for the ground wire, which must be connected to ground reliably. The left hole is the neutral wire, and the right hole is the live wire. ) 3. Pour 95% pure anhydrous ethanol into the cold bath; make sure that the liquid level is about 1 centimeter above the upper edge of the bath to prevent it from leaking out. 4. Turn on the “Power” switch, and uniform mixing begins inside the bath. A few seconds later, the temperature inside the bath is displayed on the temperature control panel. Press the “Set” button on the panel; the SP character will appear. Then press the “Increase” or “Decrease” button to set the desired temperature. Press the “Set” button again to complete the setting, at which point the indicator light will turn on. 5. Turn on the \"Refrigeration\" switch; the compressor inside the unit begins to cool, and the cooling fan starts to exhaust air, causing the temperature inside the bath to drop. Once the refrigeration indicator light goes out and the ＜Heating＞ light starts flashing, it indicates that the cold bath has reached a constant temperature, and at this point the test can be carried out according to the specified method. 6. To check whether the sample has solidified, turn on the “timing” switch; the digital display will show “000”. Pull the test tube to a 45-degree angle by hand, start the 60-second timer, and once the alarm sound is heard, remove the test tube from the bath to examine it. 7. Fill the freezing point test tube with the oil sample up to the marked line, place the freezing point ring into the hole in the bath, insert the test tube into that hole, and insert the thermometer into the rubber stopper of the test tube. 8. First, determine the distance of the mercury level in the thermometer from the oil sample (in accordance with standard specifications). Place the rubber stopper on the test tube and secure it tightly. Then check the distance of the mercury level at the bottom of the thermometer from the oil sample (again in accordance with standard specifications). When the temperature approaches the freezing point, for every 1-degree drop in temperature, pull the test tube and turn on the timer; tilt the test tube 45 degrees and wait for 1 minute before removing it. Check whether the oil has solidified; if not, place the test tube back into the bath with it upright, wait another 1 degree, and then remove it again to check, repeating this process until the oil solidifies – that temperature is the freezing point.