Boveda for Cigars | One-Step Calibration Kit | Preloaded with 75% RH Humidity Control Pack | Precise Salt Test for Digital and Analog Hygrometers and Humidity Sensors | 1-count

Humidity is a tough one to nail down. That pulse sensor would suffer from the same problem as your AC infinity sensors. They can be calibrated with a salt water solution. I’ve never tried it myself, but I think I will buy this and do it now. https://a.co/d/0h9hfu6N