Other instruments for measuring variables of liquids or gases not named above, such as calorimeters for flow, steam meters and combined flow-and-heat instruments.

Describe the measured variable and fluid on the invoice; give operating range and certification. Measuring and analytical instruments are precision goods: provide calibration certificates traceable to national standards, accuracy specifications and operating manuals, and pack in foam-lined cases with desiccant to protect sensors and optics from shock and humidity.