how to make an anemometer

{"cid":"91199506","title":"HT605S Digital Anemometer Air Flow Wind Speed Meter LCD Backlight Professional 3 in 1 Thermometer Hygrometer Anemometer","imgUrl":"https:\/\/img.chinax.com\/nimg\/61\/57\/6520f9cf775f31462c98722e25a6-200x200-1.jpg","attrs":{"Brand Name":"HABOTEST","Model Number":"HT605S","Minimum Order Quantity":"1-1000pcs","Delivery Time":"35~40 days","Certification":"CE","Place of Origin":"Guangdong,China","Payment Terms":"L\/C, T\/T","Air Velocity range":"0.7-30m\/s","Data Hold":"Yes","Backlight":"Yes","Max\/Min Hold":"Yes","Low Battery Indication":"Yes","Auto Power off":"Yes"}}

{"cid":"91198955","title":"Piezo Ultrasonic Air Transducers 200KHz For Anemometer \/ Wind Direction Ranging Sensor","imgUrl":"https:\/\/img.chinax.com\/nimg\/c5\/e8\/860e49161998e1d1caf3870384d2-200x200-1.jpg","attrs":{"Price":"Negotiable","Brand Name":"TaiMI","Model Number":"TM-18MM-200KTR with long cable connect air sensor","Minimum Order Quantity":"1000pcs","Delivery Time":"2 weeks","Certification":"ROHS\/REACH","Place of Origin":"CHINA","Payment Terms":"Western Union, MoneyGram, T\/T ,PAYPAL","Supply Ability":"10000000\/Month","Packaging Details":"safety packing","thpe":"TM-18MM-200KTR with long cable connect air sensor","Output":"Digital Sensor gas sensor","Sensitivity":"Adjustable SENSOR","USE":"Air use Gas flow rate sensor","color":"black\/brown","Product name":"200KHZ gas transducer","Application":"transmitting and recieving","Size":"16\/18mm waterproof piezo ultrasonic sensor","Material":"High high-temperature material material transducer","Usage":"level sensor","Center frequency":"200khz +- 1khz"}}