the home site for casella and cel products in the north american continent. information on noise, dust, particulates, heat stress, wbgt monitors, weather monitoring, air sampling sensors, filters, noise dosimeters, octave band analyzers, real time noise analyzers, pc software, calibration, calibrator, loudness, sound quality, reverberation time, noise reduction, personal hearing protection, ear muffs, ear plugs, casella usa, cel sound level meter, casella, cel 440, cel 480, cel 593, casella cel, casellausa, cel instruments, cel instrument, cel 281 dosimeter, fast, slow, impulse, peak, a weighting, b weighting, c weighting, z weighting, dnl, ldn, cnel, ltm3, ltm5, taktmax, rs232, analog output, digital output, measure rms of sound, rms noise level, peak sound level, maximum sound level, minimum sound level, average sound level, twa, lavg, lmax, lmin, max, min, leq, dose, percent noise dose, percent dose, excedance level, threshold level, criterion level, cel soundtrack db10 software, c