O2 Meter,0 to 30%, pen type

O2 (Oxygen in air), Temp
O2 range: 0 to 30% x 0.1%
With Alarm: If the measurement Air oxygen value < 18.0 %O2, the buzzer will sound for warning.
Temp:0 to 50degC
Measurement response time: 30 seconds
Pen type, easy operation & carryout
DC 1.5V battery