Wilhelm Keiner
Wilhelm Keiner Aräometerfabrikation, Glass, Quality-Hydrometers (Thermometer, Baume-hydrometer, Saccharimeter, Alcoholometer, Mineraloil-Hydrometer, Brix, API, ASTM, BS718, DIN)
http://www.wilhelm-keiner.com/PRODUKTE.htm

Hydrometer GmbH
Willkommen auf der Homepage von Hydrometer
http://www.hydrometer.de/

Explorer Technology Group (ETG)
Manufacturer of hydrometers and voltage data logging products for standalone or software-based automated battery testing. Also offers equipment repair and service. Product photos, specifications, and prices.
http://www.explorergrp.com/

Stevenson Reeves Ltd.
Manufacturers of precision hydrometers for industrial, laboratory, and home uses.
http://www.stevenson-reeves.co.uk

Nubila SAS
Developer of meteorological software and hardware for data processing and nowcasting, including the rain gauge-disdrometer PLUDIX, based on backscattering of a MW beam by hydrometers. Italian company, site in English.
http://www.nubila.net/

Franz Widder GmbH
manufacturer of measuring instruments like hydrometer, spiritmeter and thermometer, laboratory equipment: german thermometer manufacturing
http://www.widdernet.de/

Greers Ferry Glass Works
Scientific glassware such as hydrometers, thermometers, viscometers, centrifuge tubes and refractometers. Custom and off-the-shelf designs.
http://www.gfglass.com/

ICL Calibration Laboratories, Inc.
Calibrated ASTM thermometers and hydrometers, calibration services offered.
http://icllabs.com/

Kessler Instruments, Inc.
Thermometers, hydrometers, tank gauging equipment, pocket, standard, calibration services.
http://www.kesslerusa.com/

Density Calibration Laboratory
World-class Density Metrologists
http://www.density.co.uk/