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The coin cell battery backup lasts for years Included libraries and example code for both SD and RTC mean you can get going quickly
Continuity Test
1x Micro USB Data port and Mini HDMI Port (comes with Micro USB ‘On the Go’ adapter and Mini HDMI to HDMI adapter)
Unipolar and bipolar modulation
A37 UNI T CO2 Carbon Dioxide Meter gm640 meter The coin cell battery backupA37 is used to detect CO2 concentration in different environments. The LCD displays CO2 concentration, temperature, humidity, and date time together. Air quality is indicated with emoticons. When CO2 concentration gets too high, audio and visual alarm will go off. Features: 1. Automatic baseline correction2. Audible and visual alarm 3. Low battery indication 4. Auto power off 5. Backlight Technical specifications: Range Resolution Accuracy Carbon