Simply unfold the caliper and the device turns on. I find myself pulling out the battery when I'm done to keep the device from turning on and banging into the toolbox. Otherwise it would be 5 stars.
π Enhanced Precision with Backlit Professional Manometer for Differential Ventilation
6 Review
π Dioxide Controller for Digital Gas Monitoring
5 Review
Portable Handheld Manometer π for Accurate Pressure Differential Measurement
5 Review
π₯ Advanced Testo Wireless Hot Wire Anemometer Technology
4 Review