1. Test Oxygen in the office, workshop, train, bus, mine, mountain, vessel cabinet ect. 2. With backlight, alarm with light and

Features

1. Test Oxygen in the office, workshop, train, bus, mine, mountain, vessel cabinet ect. 2. With backlight, alarm with light and sound.

3. Low battery indicate

4. Easy operation

Specifications: 

Range: 0~25%VOL

Accuracy: ±0.5%

Power: 3x1.5V AAA

battery Size: 172x51x26mm