i'm not familiar with that thermometer/hygrometer combo, but i'm sure it works fine. u can always use a tried and trusted Accurite. alotta peeps use that. i use this one in my 2 tanks to track ambient temps and humidity - https://www.amazon.com/BeGrit-Thermo...7240452&sr=8-1 i use a generic version of this https://www.amazon.com/Zoo-Med-Digit...7240622&sr=8-2 for my probed hot spot thermometer.
i use a laser temp gun to spot check temps. even tho the surface temp may not feel hot or warm to the touch of my hand b/c my body runs @ 98degrees, the probe and laser temp gun tells me my undertank heater and thermostat is working, nice, warm and safe for my BP's at 90degrees or so.