Hydrometer stand and container insert

This is a stand for Hydrometers selling on Amazon (https://www.amazon.co.uk/dp/B07QCTHRF8?ref=ppx_yo2ov_dt_b_fed_asin_title) and also fit in cereal containers available on Amazon (https://www.amazon.co.uk/dp/B0D49JVXWV?ref=ppx_yo2ov_dt_b_fed_asin_title).