Abstract: An adjustable water level device which may be used to match an unknown level to a reference level. The reference level may be easily adjusted by sliding a transparent cylinder inside an outer foam lined cylinder. An additional biasing spring is provided to assure safe movement of the transparent cylinder. The adjustable water level device may be attached to a vertical surface by driving nails or screws through openings in a supporting bracket or may be attached using hook and loop pile fastener type material. An offset bracket is provided so that the adjustable water level device may be mounted in the presence of obstacles such as wall moldings.