Extech Instruments Carbon Monoxide Meter Desktop CO50. The CO50 features visibly brightLEDlights which indicate active monitoring (green) or a surpassed CO alarm threshold (red). The meter also features an extra loud audible beeper alarm... more
ANENG B14 24-250V Tester Electric Induced Electric Screwdriver Probe With Indicator Light Sound and Light Alarm Test Pen LED indicate light long service time and convenient to view detection . With self checking function to know whether pen battery... more
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