Review on 🐠 MA STRAP 500W Submersible Aquarium Heater Titanium Fish Tank Heater with Digital Temperature Display & External Thermostat Controller - Ideal for Freshwater and Seawater by Jackie Bear

I really like it. However, a suggestion. Make the controller more waterproof. Because it is a water heater. You know there's always water nearby, and there's many, many, many chances of all of this falling into the water! So make it more waterproof! I bought two but my dad accidentally dropped the controller in the water. Then we knew. I suspect that the device has become defective. If you make the controller fully waterproof. You will find success and save a lot of money on product returns due to water leaking into the controller (: love it. Hi-tech LED display directly on the heater under glass. Incredibly simple and easy to use. I recommend purchasing the heater yourself make -calibrate it calibrate it by myself once a month or a year, because sometimes old people don't get used to the advanced RP technology, so they don't know how to calibrate it, because it's so confusing (: Me am an engineer and i am having trouble even remembering the calibration steps!Need a simpler, more concise and simple user manual. I propose a page with big words and double white space that a small child can understand in just 20 seconds.Because we have many electric devices and manuals, sometimes we may lose them, so we don't know or forgot how to calibrate it, so self-calibration is good! D he EDIT2 error appears after a few months of use. it does not work.