Review on 🔧 HVAC Refrigerant Charging and Troubleshooting Reference Cards for Quick Solutions by Bob Vulpes

Useful information but not for beginners. This is for reference, just in case. The printed font is pixelated, making it difficult to read for some. I think the material provided is great but the maps are below the quality of the information and need to be the same to make them equally great. I haven't used them, but it's good to have them just in case. The information is still consistent with the instructor's materials at the training center.