The Sthor decibel meter provides an accurate and reliable way to measure sound levels in the 30-130 dB(A) measurement range. This compact and lightweight meter is designed to offer excellent portability and ease of use in a variety of environments, such as industrial plants, offices, train and traffic noise measurement, and IT environments such as fan noise measurement.

Large numbers on the display, clear LCD display, and intuitive functions make monitoring the measurement effortless. Meter overshoot alarm, Max/Min function, and Data Hold function add practicality by providing the ability to monitor sound extremes and lock measurements on the screen for review. Automatic power-off function after 10 minutes of inactivity saves batteries (can be disabled when turning on the device). The product is equipped with a 1/4'' tripod mount, which allows the meter to be stably positioned during measurement.
Specifications

Measurement range: 30 ~ 130 dB(A)
Measurement accuracy: ± 1.5 dB
Measurement resolution: 0.1 dB
Frequency range of the measured signal: 31.5 ~ 8,000 Hz
Measurement scale: Corrected according to correction curve A – dB(A)
Supply voltage: 4.5 V DC
Battery type: 3 x AAA
Weight (without batteries): 98 g
Operating conditions: 0 ~ +40°C; 10 ~ 80% RH
Storage conditions: -10 ~ +60°C; 0 ~ 90% RH

Safety instructions
The product is not waterproof and should be kept dry. Do not expose to rain or immerse in water or other liquids. When measuring outdoors, use a windscreen for the microphone to minimize measurement errors. If the frequency of the sound being measured is not within the frequency range specified in the technical data, the measurement may be incorrect. Always replace batteries in pairs and store the product in the right conditions for long storage periods.
Product use
Installing and replacing batteries
Open the battery compartment cover, remove any old batteries and install new batteries, observing the correct polarity. Use high-quality alkaline batteries for best performance.
Device commissioning
Turn on, the device will automatically measure the sound level and the results will be displayed on the screen. Do not move the meter suddenly during the measurement. The HOLD button locks the sound level on the display. The MIN/MAX button displays the minimum or maximum measured value. The device also allows you to set an alarm value, when exceeded, the display backlight will flash.
Calibration
The product is factory calibrated, but we recommend calibrating the device at least once a year. Calibration requires a reference sound source. Do not calibrate without a reference sound source, as this may lead to incorrect measurement results.
Maintenance and storage
The product does not require any special maintenance. Clean the housing and microphone with a soft, slightly damp cloth and then dry. Store the product in the specified conditions and protect it from moisture, dust and direct sunlight.