digital timers, temperature indicators, humidity calibration equipment, hour counting timers, glass thermometer accessories, mercury displacement relays, laboratory equipment, instrumentation services, temperature calibration equipment, general purpose control relays, humidity indicating or recording instruments, hydrometers, hermetically sealed relays, thermometer calibration, thermometers, bimetallic thermometers, digital thermometers, electronic thermometers, infrared thermometers, timers available from h-b instrument co. based in collegeville, pa. click the links below to visit our website or contact us via our profile page.