â·ÃÊͺ¶ÒÁÃÒ¤Ò Coiled probe extends to 9’. This unique sound meter enables remote sound level readings using a detachable probe. Detachable Probe Sound Meter Sper Scientific 840012 Enables remote sound level readings Coiled probe extends to 9’. This unique sound meter enables remote sound level readings using a detachable probe. Features both RS232 computer interface and AC output. Also has A and C decibel frequency weighting scales, fast or slow time weighting, min/max, hold and peak hold functions. Meets IEC 61672 class 2 and ANSI S1.4 type 2 frequency and time weighting specifications. Covers 30~130 dB in both Manual and Auto ranging scales with 0.1 dB resolution and an accuracy of ±1.5 dB. Calibrate in compliance with OSHA using Acoustical Calibrator 850016 or equivalent. Has a fold out easel back and tripod screw. Comes ready to use with a windscreen, calibration tool, instructions and 9V battery in a hard-shell foam-lined carrying case. N.I.S.T. traceable certificate of calibration available. Dimensions: 8" x 2½" x 1" (250 x 68 x 30 mm) Weight: 8 oz (225 g) with battery Specifications Operating Temperature: 0°C to 50°C (32°F to 122°F) Operating Humidity: Less than 80% RH Frequency: 31.5 to 8,000 Hz. Dimensions: 8" x 2½" x 1" (250 x 68 x 30 mm) Weight: 8 oz (225 g) with battery 840012 Sound Level Meter Sper Sceintific à¤Ã×èͧÇÑ´¤ÇÒÁ´Ñ§àÊѧ à¤Ã×èͧÇÑ´àÊÕ§