The ASD HandHeld 2 provides the ideal combination of performance, portability, and durability. The ASD HandHeld 2 spectroradiometer employs a high-sensitivity detector array, a low stray light grating, a built-in shutter, DriftLock dark current compensation, and second-order filtering to produce a high signal-to-noise spectrum in under a second.

Field data acquisition is streamlined with embedded remote sensing software. The results are shown on an integrated, high-visibility color display making sample collection simple, in challenging areas without the worry of carrying a computer.

When connected to a computer, the full range of RS3 spectral data processing features is available.

Designed with an ergonomic dual position “D” handle, the hand-held spectroradiometer is equally suited for right or left-hand operation. Compact, rugged and light-weight, the ASD HandHeld 2 weighs 1.17 kg (under three pounds) including batteries.

With a wavelength range of 325 nm – 1075 nm, an accuracy of ±1 nm and a resolution of <3 nm at 700 nm, the HandHeld 2 hand-held spectroradiometer delivers unsurpassed performance and helps expedite fieldwork and reduce errors associated with changing environmental conditions.

The optional GPS accessory records GPS coordinates with each collected spectrum and eliminates the need for external location record keeping.

In addition to being an easy-to-use spectroradiometer, the Handheld 2 can serve as a VNIR-only hand-held spectrometer when used with a fiber optic cable and contact probe accessories.

  • Wavelength Range: 325-1075 nm
  • Wavelength Accuracy ±1 nm
  • Spectral Resolution <3.0 nm @ 700 nm
  • Noise Equivalence Radiance (NEdL): Standard: 5x10-9W/cm2/nm/sr @ 700 nm
  • Integration Time: 8.5 ms minimum (selectable)
  • Field of View: 25° (optional fore optics available)
  • Memory Storage: Up to 2,000 spectrum files
  • Power: Four AA batteries (standard or rechargeable) or 5 V 1.5A AC/DC adaptor
  • Battery Life: Factory supplied rechargeable: up to 2.5 hrs, Lithium: up to 5 hrs (manufacturer dependent), Alkaline: approximately 1.5 hrs
  • Display: 6.8 cm (2.7 in) diagonal, tilting color LCD
  • Interfaces: One Mini B USB (PC communications), One Mini TRS jack (Remote trigger), Two Type A USB (Future use)
  • Computer: Software RS3 controlling software ViewSpecPro post processing software HH2 Sync interface software
  • Targeting: Integral red laser (available with optional sighting scope)
  • Weight: 1.2 kg (2.6 lbs) (w/batteries)
  • Dimensions (H x W x D): 90 x 140 x 215 mm (3.5 x 5.5 x 8.5 in)
  • Temperature Range: 0° to 40° C
  • Tripod Mount: ¼”-20 Mounting hole
  • Standard Accessories: Hard shell carrying case (meets FAA carry-on requirements), Spectralon® white panel, 4 rechargeable batteries, battery charger, AC/DC power supply, USB cable, USB memory stick and D-handle

ASD HandHeld 2: Hand-held VNIR Spectroradiometer

Probes and Lighting


The ASD Contact Probe is designed for contact measurements of solid raw materials such as minerals, grains, other granular materials. Its innovative optical design minimizes measurement errors associated with stray light and allows for measurement of samples through clear and transparent plastic bags.

In addition to the standard contact probe, ASD also offer the Hi-Brite contact probe and the Plant Probe.

All contact probes are available with a ruggedized cable feed and cable, designed for applications that involve extra cold or harsh temperatures. (see image below specifications)


Length10" ( 25.4 cm)
Weight1.5 lbs (.7 kg)
Power requirements12-18 VDC, 6.5 W
Lightsource type/Life (approx.)Halogen bulb/1500 hours
Halogen bulb color temperature2900 K
Spot size10 mm

The same design, features, and benefits of ASD's standard contact probe, but with a higher intensity illumination setting on the sample window. This higher intensity illumination is ideal for inorganic applications, and is recommended for mineral and ore characterization in mining exploration and research applications using the TerraSpec®, FieldSpec® 4 Hi-Res and LabSpec® Hi-Res spectrometers.


The same great design and functionality as ASD's standard contact probe

 with a lower intensity bulb position for non-destructive data collection from live vegetation and other heat sensitive targets.


ASD's Leaf Clip assembly is designed specifically for use with the Plant Probe to simplify the process of collecting spectra on live vegetation. The unique design includes a gentle trigger lock/release gripping system for holding the target sample in place without removing the leaf from its habitat, or inflicting damage.

Integrating spheres collect reflected light from samples over a full hemisphere. The sphere, by nature of its internal diffuse (lambertian) reflection and integration of the energy, is insensitive to directional reflectance features coming from the sample, and therefore, gives a very repeatable “averaged” response to the reflectance of the sample placed in the beam at the sphere port. Sample placement and incidence beam/collection alignment are less critical to the measurement results because the integrating sphere looks at representative averaged energy from all angles at the same time.

General Accessories


ASD offers multiple pistol grip options for superior ease-of-use and adaptability to a variety of environmental and situational elements, when using your FieldSpec® and FieldSpec HandHeld instruments. All pistol grip designs include the quick-connect/disconnect fiber optic cable snap-in feature, pistol grip clip assembly for safely and securely affixing the pistol grip to your waist-belt on the back pack, and many offer a built-in bulls-eye level for added precision.

Fore Optics


The Equatorial Mount is used to maintain the orientation of the Direct Irradiance Attachment (sold separately) and the Full Sky Irradiance RCR (sold separately) relative to the sun.

Once the mount is manually aligned with the Earth's rotational axis and proper solar alignment is obtained using the directional keypad, this mount scans in synchronization with the motion of the sun through the sky.

The mount is powered by a rechargeable 12 volt gel cell battery pack included with the mount. The heavy duty tripod on which the mount is installed is also included. The FieldSpec® spectrometer is mounted on a tripod (available separately). The tripod tray is not a standard item.

For use with all FieldSpec® and HandHeld models.

Reference Panels


ASD carries a wide array of calibrated and non-calibrated diffuse white and gray reference panels in varying sizes (from 2 x 2 in. to 12 x 12 in. or 5.1 x 5.1 cm to 30.5 cm x 30.5 cm) and reflectance levels, including encapsulated gray scale (NIST/NRC traceable) wavelength and USP standards for USP 1119. Calibrated panels come with certificate and documentation showing standard deviation and reflectance factors.

All reference panels and standards may be purchased separately. To provide our customers with a more cost-effective approach, specific sizes or styles of reference panels are included in accessory bundles designed for maximum compatibility with a particular application.

Your ASD sales representative will be able to advise you on the best option(s) for your needs.

Plant Physiology

Application Note

Snow and ice

Application Note

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