SPL meter has been designed to meet the measurement requirements of Safety Engineers, Health, Industrial safety offices and sound quality control in various environments. Full professional features include easy-to-read 4-digit LCD display with selectable permanent backlight; selectable A or C weighting and Fast or Slow response; maximum Hold selector with Hold button to capture input at any time; alarm indicating the input is above range; internal battery tester; built-in calibrated, linear omnidirectional 1/2” electrets condenser microphone; and threaded insert to attach to optional SMT-3 tripod or standard camera tripod.