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Charging R22 vs 410A refrigerant hvac basics
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Here are some tools you may need

Testo Digital Pocket Vane Anemometer
https://amzn.to/3KtMcda

Ductulator
https://amzn.to/3AunFjf

Tape Measure
https://amzn.to/3CEAZ7w

Fieldpiece SC440 True RMS Clamp Meter
https://amzn.to/3PP7XVQ

Fieldpiece SRH3 InDuct Digital Psychrometer
https://amzn.to/3wuPZki

HVAC Service Wrench
https://amzn.to/3mxXLZg

Yellow Jacket 42004 Series 41 Manifold with 31/8" Gauge
https://amzn.to/3yaYAd3

Fieldpiece DualPort Manometer SDMN5
https://amzn.to/3SNNLoS