FNIRSI FDM-01 is a compact handheld digital noise meter for environmental noise measurement. It uses a 6mm high-sensitivity condenser microphone, with measurement range 30~130dB, ±1.5dB accuracy, 0.1dB resolution, and frequency response 31.5Hz~8.5kHz. It supports FAST/SLOW time weighting and A-weighting, and simultaneously displays ambient temperature and humidity. It features MIN/MAX/AVG value recording, data hold, overload indication, and adjustable threshold light alarm. Equipped with a VA color screen with backlight, built-in 600mAh rechargeable lithium battery and Type-C charging. It complies with IEC651 Type 2 standard. Widely used for home noise inspection, factory workshop, construction site, office environment and audio equipment testing.

• 3-in-1: noise decibel + ambient temperature + humidity measurement
• 30~130dB measuring range, 0.1dB resolution, ±1.5dB high precision
• A-weighting, FAST (125ms) / SLOW (1000ms) response switchable
• MIN / MAX / AVG recording, data hold, OVER/UNDER overload reminder
• VA color screen with backlight, clear reading under strong light
• Adjustable threshold light alarm for exceeding noise limit
• High-sensitivity condenser microphone with windproof foam cover
• Built-in 600mAh lithium battery, Type-C rechargeable, auto power-off
• Compact lightweight handheld design, easy to carry to field sites
• Meets IEC651 Type 2 standard, suitable for home, factory and environmental testing