Overview Reviews Product Description This carbon monoxide meter is capable of detecting concentrations up to 1000ppm. The R9400 features a backlit LCD display with data hold/max functions and user adjustable alarm limit. Backlit LCD displays CO levels from 0 to 1000ppm and ambient temperature User adjustable alarm limit (audible beep frequency increases as CO level rises) Quick response and high accuracy Data hold and max functions Self test sequence on start-up Low battery indicator and auto shut off Reed Instruments Catalog R9400 Datasheet Product Videos Custom Field Product Reviews Write a Review Write a Review × Reed Instruments Carbon Monoxide Meter w/ Temperature R9400 Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Review Subject * Comments *