Overview HK-264A Acid value and acidity tester for petroleum products is suitable to the standard of GB/T 264 and GB/T 258. It is used to test the acid value and acidity for petroleum products HK-264:single element HK-264A:double elements Features 1. Stepless solid-state voltage regulation, output without electric, no spark, no noise, stable performance. 2. Heating jacket heating no flame, safe and reliable. 3. The instrument uses double (single) device. 4. Voltage table shows clear, accurate temperature, good insulation properties. 5. Instrument titration easy to control, easy to record. 6. Simple operation with elegant structure.