Windtunnel for ST-SM-18 & ST-SM-19 You can find more items like this in the following: Accessories, Weather Instruments   Quantity in Basket:none Code:ST-SM-WT Price:$35.00 Shipping Weight:1.00lbs.       Quantity:   The wind tunnel is used when precise wind speed needs to be measured along a specific axis (direction), for example in precision shooting. Simply slide the wind tunnel over the SM-18 or SM-19 (the SM-28 case is too wide) and align the tunnel to the direction you wish to measure (which is not always the direction from which the wind is coming). The resulting LCD readout is the windspeed vector along the specific axis. Related Item(s) Code Name Price ST-SM-18 SKYMATE Windmeter $89.00 ST-SM-19 SKYMATE Plus $150.00

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