I like the way these heaters are designed with a heavy shield to keep critters off them and with the color temperature available from across the tank at a glance. And an easy to adjust setting as well.
Tested with calibrated meter and alcohol thermometer and it is right on for temp. Works perfectly and the screen is easy to read.
Haven’t installed yet but love the digital display and that I can set the temperature and it’s not a preset.
Fluval Submersible LCD Aquarium Heater