I have my ball python in a 55 gallon long with a screen top. I use one of those humidity gauges that you mentioned. Although, probably not as accurate as a digital, I haven't had any problems with shedding or respiratory infections. I use cypress mulch, which helps with humidity levels.

Be careful with keeping humdity levels too high. I tend to only mist during shedding. The water dish, combined with heat, tends to keep humidity at appropriate levels otherwise. To keep humidity or to increase humidity, I use a towel to cover the screen top.

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