this one stays on when plugged into the wall.
https://www.amazon.com/gp/product/B00KYA0RC2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
thank you kind sir! now i'll be able to track how much co2 i'm using the nearest 0.1oz,
(and all for just the price of co2 refill!)