I bought the Zillia and tried if for part of one hatch. I took it out and stomped it with my foot. The worst thermometer I have ever tried. The accurite's work well but where most people find problems with it has nothing to do with the thermometer itself. What happens is they place the unit inside the incubator where it is subject to humidity changes. The rise and fall of humidity levels can, will, and does effect the temperature readouts. Even tho you are dealing with low voltage electricity, water and electricity dont mix. As the mositure accumilates inside the Accurite and around the temperature senosor, it effects the voltage signals being relayed to the digital readout. Any variation in electricity will result in a different temperature reading than the thermometer is designed to display. To solve this, I use only the external sensor that comes mounted on the wire to place inside the cabinet. I remove it from its protected cover and coat with the rubber electrical liquid tape. I then place the wired sensor in the trays along with the eggs. I keep the actual Accurite unit outside the cabinet. I will use another meter placed inside the cabinet to measure humidity. Keep the batteries fresh and the Accurites are pretty dang accurate and dependable.
One other thing I tried and it worked verywell for a long time was to disassemble the Accurite and remove its internal sensors, including the humidity sensor, and place all three sensors on a wire. Doing this enabled me to place all three sensors, including the humdity sensor, inside the cabinet while keeping the actual meter outside the incubator itself. Doing this I was able to monitor temps in two locations inside the cabinet and the humidity with just one meter. To do this conversion, you need good eyesight, a steady hand and decent soldering skills. I lack all three so I had the conversion done for me. If you can thread a sewing needle, and have a small soldering iron, you can probably do the conversion yourself.