QwikCheck Acid Test Kit Part No. QL2000 QwikCheck is ideal for preventive maintenance checks and for verifying proper acid clean up. The QwikCheck indicator paper is golden yellow before testing and will turn pink or red upon being exposed to as little as 1 part per million (PPM) of acid. The Yellow to Red color change allows you to easily and clearly communicate the need for action to the equipment owner. Perform a Qwik acid test on operating systems. Ideal for preventative maintenance checks or for verifying proper acid clean-up after a compressor burn-out /change-out. Features: Color Change Indicates Pass/Fail Tests for Inorganic Acids to the ARI-700 limit of 1ppm Works with All Refrigerants Oils Meets EPA Venting Regulations Unique Patented Disposable Design