For a humidity gauge there's a digital one for like 8 or 10 bucks at Walmart otherwise for 12 bucks and some change u can get the all in one thermometer its got indoor/outdoor temp and a humidity gauge built in.
You take the probe and put it in the substrate or right on the glass above the heatpad so you know the hottest spot in the tank. Then set the thermostat to 90-95 so your hot spot can't get over 100 and worry about them getting burned.
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