511 Grain Angle Meter

The Model 511 Grain Angle Meter measures grain angle in wood as the direction of maximum dielectric permittivity projected onto a flat surface of the wood relative to a reference direction. The Model 511 consist of a stationary detector, operating controls, digital display, and USB port integrated into a handlheld unit.

The detector causes radio frequency (RF) fields to be applied to the wood through defined areas on the wood surface, and senses the field at another area on the wood surface. The sensed signal is amplified and processed to determine grain angle.

Detection Principle

Permittivity relationship to fiber orientation

Detector Implementation

Noncontacting, stationary electrode array

Sensor Area Diameter

1.00 in (25 mm)

Probing Frequency

500 kHz

Max. Moisture Content In Wood

Approximately 20%

Sensor to Wood Spacing

From point of contact up to approximately 0.1 in (2.5 mm) air gap

Attitude Restrictions


Operating Temperature

41°F to 104°F (5°C to 40°C)

Operating Humidity

Up to 90% Noncondensing


Four (4) AAA batteries or external USB supply (provided)


Approximately 4 X 7.5 x 1.5 in (102 X 191 X 38 mm)


Approximately 1 lb (0.45 kg)