50 lb / 22 Kg Hanging Scale spl_bfg If your Rx glasses are

If your Rx glasses are big

and are designed to hold all types of grow media like potting soil

30 Pint is 4

The yellow LED indicator shows CO2 level equal or above 800ppm which means supplemental CO2 is in use

Just set the fill and drain cycles

50 lb / 22 Kg Hanging Scale spl_bfg If your Rx glasses areZenport ADZH50 Accuzen hanging mechanical spring dial scale accurately measures weight of grain, herbs, food, produce, metals and packaged goods. The scale features a dual read out of pounds plus ounces and kilograms on the dial face. The scale's 9 inch by 9 inch stainless steel platform is easy to clean and is non corrosive. Includes plated top loop and bottom hook for hanging. Available in two sizes: 50 lb 22kg and 100 lb 45 kg. Easy to clean and is