Sound Level Meter (30..130 dB) 
UNI-T’s UT351 Sound Level (30~130dB) Meter has A&C frequency weighting mode. 2 power supply methods and fast/slow sampling rate are selectable.
 
1. MAX/MIN modes
2. Auto power off (cancelable)
3. AC/DC analog signal output
4. Over/under range indication
5. Data hold, LCD backlight
6. Simulated analog bar
7. A (ear)/C (machine) weighting modes
8. Manual/auto range selectable
9. Fast/slow response rate (fast: 125ms, slow: 1s)
10. Powered by batteries or external power source