How much does this cost to the nearest dollar?

Preciva Digital Psychrometer Thermo-Hygrometer, LCD Mini Temperature and Humidity Meter with Dew Point and Wet Bulb Temperature Hygrometer for Industry, Agriculture, Meteorology (9V Battery Included)
2 in 1 FUNCTIONs -- This digital Humidity & Temperature Meter & Wet Bulb Temperature Dewpoint Temperature is designed to combine the functions of humidity meter, temperature meter, wet bulb temperature and dewpoint temperature. Multi- Applications -- It is an ideal Humidity & Temperature Meter instrument with scores of practical applications for laboratory, industrial, engineer and professional. Backlit & Portable -- Small form factor easy to use, with a white backlit dual display LCD screen can be used in a dark environment. Easy to Use -- The humidity & temperature meter is equipped with a humidity/ semiconductor sensor.,

Price is $28.00

Price: $27.99