Designed for Compatibility: Specifically engineered for R134a and R1234yf systems, this car air conditioning oil tester ensures compatibility and accurate diagnostics. Before testing, confirm your vehicle has adequate refrigerant to avoid inaccurate readings due to refrigerant shortage. Prevent Compressor Failures: Frequent causes of air conditioning compressor failures include low and contaminated oil levels. Utilize this cost-effective oil checker to prevent expensive compressor replacements and avoid vehicle downtime. Efficient Main Function: Our AC oil checker swiftly determines both the oil level and the presence of harmful acids in your air conditioning system's oil without the need to alter the system or drain the oil completely. Simple Operation Process: Easily test your air conditioning system by aligning this tool with the low-pressure port, pressing firmly, and releasing quickly. Repeat twice for a quick assessment of your car's AC oil status without any hassle. Optimal Testing Conditions: For accurate testing, open all car doors or , set the airflow to maximum, and cool the temperature setting. Run the vehicle for a few minutes to stabilize the system before conducting the oil level check. Color:White Material:Plastic + Cotton Package Contents: 10 * Car Aircon Oil Checker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.