Valcomft. s digital sound level meter Pro II features professional instrumentation compact newly designed shape high tech high performance Easy Max/Min Functions 32 to 130 dB/3 Ranges A/C Weighting Resolution 0.1 dB IEC 651 Type II Power Requirement: One 9 Volt Battery 006P or IEC 6F22 or NEDA 1604 (Battery Included); Shipping Weight: 1 lbs. (.45 kg) Dimensions: 9.1in. H x 2.1in. W x 1.3in. D (23.11cm x 5.33cm x 3.30cm)