2-Pt. Acoustical Calibrator - Class 2 rock-bottom Nordic Pure 12x36x1 MERV 14

Nordic Pure 12x36x1 MERV 14 Plus Carbon air filters are made of electrostatically charged synthetic materials with an added flat panel infused with activated charcoal that attracts and capture most airborne particulates in your home

Iris Borer (Macronoctua onusta)

Key features include quick and easy uptake of water and the even distribution of water throughout the substrate

Mesh increases diffusion—no hot spots

Choose AQUAvalve to replace older

2-Pt. Acoustical Calibrator - Class 2 rock-bottom Nordic Pure 12x36x1 MERV 14For calibration of all Sper Scientific digital sound meters or any sound level meter with 1 or microphone. Conforms to ANSI S1. 40 1984 and IEC942 1988 Class 2 standards for acoustical calibrators. Simply place the calibrator on to the digital sound meters microphone, turn on the calibrator, and adjust the decibel meters reading to either 94 or 114 dB. Operates at a frequency of 1KHz 4% and with an accuracy of 0. 5 dB. Built in battery check. Easily