DB SPL readings differ from external sound level meter?

1. Is dB and SPL the same?
2. Are SPL apps accurate?
3. How accurate are sound level meters?
4. What is the difference between a sound level meter and a dosimeter?

Is dB and SPL the same?

Sound pressure level, or SPL, is a measurement of sound pressure that uses Pascals (Pa) as its unit of measurement. We convert that into the more popular decibel scale or dB scale.

Are SPL apps accurate?

The answer is, “Yes,” but only four apps that were tested measure up. The National Institute for Occupational Safety and Health (NIOSH) evaluated the apps at its acoustic testing lab. The tests also compared results for i-Phones and Android phones.

How accurate are sound level meters?

For compliance purposes, readings with an ANSI Type 2 sound level meter and dosimeter are considered to have an accuracy of ±2 dBA, while a Type 1 instrument has an accuracy of ±1 dBA.

What is the difference between a sound level meter and a dosimeter?

In summary, when you should use a sound level meter or a noise dosimeter. Use Sound Level Meters when you need to know the noise level of a particular task or process, or how noisy a piece of machinery or area is. Use Noise Dosimeters when you need to find out the direct noise exposure of an employee.