The Fluke CO-210 Carbon Monoxide Probe makes it easy to take accurate measurements of CO levels. As an accessory to a digital multimeter with dc millivolt inputs, the Fluke CO-210 displays CO level readings from 0 to 1000 parts per million (ppm), with a resolution of 1 ppm and accuracy of ±3%. Detach the CO-210 cord and the probe acts as a stand-alone device, with an LED indicator and a beeper that triggers with increasing frequency as CO levels rise. The beeper can be turned off when silent operation is preferred. • Rugged case and electronics • Displays CO levels on multimeter from 0 to 1000 ppm • Acts as a stand-alone device with LED and beeper CO indicators • CO indicator beeper can be silenced • Automatic sensor zeroing and self-test sequence upon start-up • Easily replaceable battery • Simple on/off switch operation • Replaceable sensor extends tool life • Includes C50 Soft Carrying Case, battery (installed) and instruction sheet