
I upped my usual water tests to 8 tests and have several reservoirs that required about two dozen tubes. The 5ml scale is accurate for the tests provided by API but their caps tend to leak so I went ahead and bought the regular rubber stoppers and they work great. Included is a link to stubs that are a good fit. Pack of 25 - CleverDelights Solid Rubber Stoppers - Size 000 - 13mm x 8mm - Length 21mm - Black Lab Stopper #000 https://www.amazon.com/dp/B01LZWPWFN/ref=cm_sw_r_cp_apa_i_UyudCbSB2ZX9Q

Vacuum cleaner TEQQO Aquastick 3 in 1 Power, grey/turquoise
26 Review

Efficient 2-In-1 Magnetic Fish Tank Cleaner With Non-Slip Design And Scratch-Free Blades
37 Review

π§² Efficient Magnetic Fish Tank Cleaner: KEDSUM Floating Clean Brush with Handle Design
34 Review

Jasonwell Magnetic Aquarium Fish Tank Glass Algae Cleaner - Floating Brush (L Size)
37 Review