Obtain quick and accurate wet- and dry-bulb temperatures with this handy instrument. Two mercury-filled thermometers, recessed in a gray metal back and attached to a folding swivel handle, provide temperature readings from -6° to 50°C (20° to 120°F) in 1° increments. With the cloth wick on one of the thermometers, simply spin the unit to obtain respective temperatures. Includes: spare wicks and instructions.