The Kestrel 4000 Pocket Weather Tracker is  the most comprehensive pocket weather meter on the market. For just under 4 ounces, you get every environmental reading with the press of a single button. The 4000 is unparalleled in its ease of use and totally customizable navigation and data display.
Kestrel..

SMX‐NFC Night Flight Call Microphone (10 meters) for SM2.
Delivery timeabout 2 weeks.
See details http://www.wildlifeacoustics.com/products/acoustic-monitoring

Dielectric high-reflective multilayer prism coating ensures superior transmittance uniformity across the visible range resulting in brighter images and more natural colours
Waterproof (up to 1m/3.3 ft. for 10 minutes) and fog-free with nitrogen gas
All-new exterior design
All lenses and prisms are..

SM2 microphone cable (10 meter)

Top-of-the-line, rugged handheld preloaded topographic maps, barometric altimeter, 3-axis electronic compass, wireless data sharing, high-sensitivity GPS receiver, colour display, microSD card slot

The NV model has the same features as Kestrel 4500 Bluetooth, but is  with a night-vision preserving backlight which helps users to sustain natural night vision. The NV's backlight incorporates an optical filter to reduce overall brightness and minimize blue and green spectrum light to preserve..

Advanced, rugged, touchscreen handheld preloaded maps (Europe recreation), barometric altimeter, 3-axis electronic compass, wireless data sharing, touchscreen, high-sensitivity GPS receiver, colour display, microSD card slot 

SM2 Power Adapter for 6/12VDC Includes cables and voltage regulator with reverse current protection in weatherproof housing. Outputs 5VDC to SM2. Increases power consumption by only 7mA.

SM2 microphone cable (50 meter)

Created by Wildlife Acoustics labs, the new SMX-Horn attachment turns our line of omni-directional ultrasonic microphones into highly directional microphones, while preserving call quality.

The attachment is designed to be used without the standard microphone windscreen and it remains weatherproof..

Compared to 4000 model, The Kestrel 4500  also calculates crosswind and headwind/tailwind with reference to a user-set target heading, and stores the information along with all the other environmental readings in its 1400 data point memory.
Pair the 4500 Wind Meter with the Kestrel Vane Mount and..

The Kestrel 2500 takes the great features of the Kestrel 2000 and adds in a pressure sensor. A three-hour pressure trend indicator helps you predict fish and wildlife activity and know when the weather's going to turn nasty. With its easy-to-use digital pressure altimeter, you have the perfect instrument..