I designed this to replace the foam insert that comes with the TF-PRO Pool Test Kit.  I wanted it to be able to accomodate a total of 3 graduated cylinders and 3 magnetic stirrers for the 3 different tests, (Chlorine, Calcium Hardness, and Total Alkalinity).

The kit comes with 2 graduated cylinders and one magnetic stirrer and I used to have to wash out one of the cylinders in order to do the last test and also wash the magnetic stirrer so I purchased a third cylinder from the website and a 3 pack of magnetic stirrers from Amazon to add to the kit.

It's the same dimensions as the foam insert, only 35mm thick instead of the 50mm foam insert, mostly because I didn't wan't to use that much filament and it is still tall enough to keep everything in place!

If you already own the TF-PRO Kit, then you only need another cylinder and the 3 magnetic stirrers.

Calibrated Cylinder: [https://tftestkits.net/Taylor-9198-Calibrated-Cylinder-p66.html](https://tftestkits.net/Taylor-9198-Calibrated-Cylinder-p66.html)

Magnetic stirrers (20mm): [https://www.amazon.com/dp/B09PDV3HB2?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1](https://www.amazon.com/dp/B09PDV3HB2?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1)

If you want the test kit, you can find it here: [https://tftestkits.net/TF-Pro-with-SmartStir-p118.html](https://tftestkits.net/TF-Pro-with-SmartStir-p118.html)