CO METER, pen type Model : PCO-350 * CO (Carbon monoxide), Temperature. * CO range : 0 to 1,000 ppm. * Temperature. : 0 to 50 oC, oC/oF. * CO response time : 30 seconds. * Data hold. * Alarm beeper. * DC 1.5V battery (UM-4, AAA) x 4. * Pen type easy carryout.