A hydrostatic level-measuring system and related apparatus and method for measuring with precision, a level normal to gravitation of a physical surface, comprising: a plurality of N water-holding cups containing water and fluidically interconnected with one another and resting upon the physical surface, where N is greater than or equal to 2; each of the water-holding cups of comprising a cup height hn thereof from a bottom to a top of the cup which cup height hn is known a priori within acceptable measurement errors; and a micrometer system for measuring on an absolute or relative scale, a distance dn between the top of each the cup and the top surface of the water wherein a meniscus visible to a user is formed when the contact occurs and the meniscus is used to guide the measurement precision.