1.Data hold freezes reading on the display. 2.ball-bearing 3.Operating Humidity:Max.80%RH Measurement units m/s, km/h, ft/min, knots, mph, Temperature: °C or °FData hold freezes reading on the displayBall-bearingMemory Recall: Record and Recall MAX and MIN readingsAuto Power off: After 15 minutes with disable featureOperating Temperature: 32°F to 122°F(0°C  to 50°C)Operating Humidity: MAX.80%RH

digital handheld Mini Anemometer PCI-81