https://www.amazon.com/gp/product/B076ZWTW7M/
I own this one, and use this one for nearly every batch I make, one gallon up to 10 gallons.
I love doing recipes by weight instead of by volume. No marking carboys, no guesswork through walls of buckets, no dipsticks into opaque containers. The front of my brewing notebook has the tare weights of my different types of fermenters, and typical weights of things like stoppers and airlocks. It makes precisely scaling-up bench trials and priming sugar calculations an absolute breeze.
I've been using this one for a year and a half. Works well for me. I use 5-6.5 gallon buckets on it.
https://www.amazon.com/dp/B076ZWTW7M/ref=cm_sw_r_cp_apa_glt_fabc_PA6FJH1SDHXD8JR763WN