... % F.S. Alarm method: light, sound and vibration Features1. Test gas in the office, workshop, train, bus, mine, mountain, vessel ... . Automatic Temperature Compensation in full range. 7. Large test range up to 0-50000ppm or 0-100% Vol. ... 1800mA rechargeable battery, 3.6VDCWeight: 200g; Size: 125x52x30mmGas: Ozone (O3)ModelGS100-O31GS100-O32GS100-O33GS100-O35GS100-O35GS100-O36Range0-1ppm0-10ppm0-20ppm0 ...