Just bought a digigro co2 monitor and regularator anyone have this?

HigH people. I found what I believe to be a good deal on eBay for a digigro coco co2 monitor and regularator. Yes thats how they spell regularator. Lol. No tank. It was priced at $369 but I offered $350 and it was accepted. The monitor auto regulates to 1200-1500 PPMS. Anyone have this co2 setup or similar? I have a cabinet that is 5'Hx3'Wx2'D and wondering what size tank I should get. I found someone locally selling a bunch of used 20LB tanks for $50. Just waiting on some feed ack from them. Anyway this is my first time using CO2 so if anyone has some advice for a rookie it will be appreciated! Sorry no link but search eBay for digigro co2. Should pop up if you would like to check it out. Thanks for stopping by!

I use to use that same set up for a little over a year you'll be very happy with your purchase. Upgraded to the CHHC-4 what a world of a difference but then again it monitors a lot more then just co2.

Thanks! Yeah I got a small setup so no need to get in over my head. Glad you liked it and I hope I do also? What size tank were you using with it? Thanks again!

I was using 20lbs at first but after having to refill it every 6-9 days i went with the 40 2-3 weeks before refill then now im using 2 40s so got about 6-8 weeks before refill

What size would suffice for my space? I was thinking the 20. It's a small space.

You have a pretty small space... I think the 20lb would last at least 2 weeks in your space, maybe 3... no need to go bigger IMO

https://www.rollitup.org/indoor-growing/28289-c02-calculator-calculate-how-long.html

You have 30 cu feet of space to fill, less really. A tank should last a looong time, use the calc too see.

yea I get at least 2 weeks out of a 20 in a 12 x 4 x 5'h sealed box. usually 4 weeks out of the first tank, 3 out of the 2nd and finish with the 3rd tank with 1/3 left.