Proteus is a true scientific-grade instrument if you are looking to take weather tracking and observing to the next level. It is our highest quality, temperature compensated, aneroid barometer. Temperature compensated and accurate to within ±0.08 inches of mercury. Displays in inches of mercury from 27.5″ to 31.5″ and in the equivalent kilopascals (93.2-106.7). Proteus is equipped with a resettable needle pointer used to mark changes in pressure. Can be adjusted to any elevation up to 8000′.  A cutaway dial window reveals an heirloom-quality French barometer movement.