The MassExact slurry density inline continuous gauge from MPV Tech calculates specific gravity by measuring direct mass over a known volume within a canister and does not require licensed and trained staff on site. Accurate up to 99.5 percent with 0.1 percent repeatability, the low-maintenance gauge features single-button calibration. It compensates for vibrations, noise and temperature. Continuous readings occur 100 times per second with a 45-millisecond data response time. 407/337-0110; www.directdensity.com.