SST1 O2 (oxygen) gas sensor. Serviceable, long-life device. Depending on use, it can operate for up to 3 years without battery replacement. The sensor has an expected life of up to 5 years. Unlike the older PDM and PDM+ models, this gas sensor only needs to be calibrated ANNUALLY, as recommended by the manufacturer! (for older models 180 days is the manufacturer's requirement) Easy setup NFC Loud alarm 95dB (from 30cm) Economical Extremely stable, fast and reliable sensors Largest LCD display (in its category) Measuring range: 0-25% Size: 2.9 x 4.8 x 8.3 cm Weight: 89 grams Temperature range: -40 - +60°C Humidity: 5 ~ 98 %RH (non-condensing) Data logger: 100 events Certifications: ATEX, IECEX, UKEX II 1 G Ex ia IIC T4 Ga I M1 Ex ia I Ma 0344 Int.Safe: Cl I Dv 1, Gr A,B,C,DT The device is extremely easy to use, so there is no need for lengthy user training. The SST1, when paired with the SST Dock, enables the fastest bump test** on the market and makes fleet management extremely easy. **bump test: function check using calibration gas, which shows whether the sensor responds to the gas. Package contents: WatchGas SST1 O2 detector calibration adapter Features and benefits: Easy setup – The WatchGas SST1 comes standard with Near Field Communication (NFC) functionality, which allows for a variety of solutions depending on your needs. Simply pair it with the WatchGas app to manage your fleet, bump test, calibrate, assign or even download logs. This means no other expensive accessories are needed. E.g. infrared connector or stupid big cradle :) Sensor – Using the latest achievements in Solid State Technology, the Watchgas SST1 models offer stability and reliability even in extreme temperature conditions. Display – The Watchgas SST1 offers the largest LCD display in the single-gas category. This customizable display shows the number of months remaining, real-time gas readings or a real-time clock. This can be easily set up using the built-in NFC and Watchgas App. With this level of customization, you can ensure that the device shows exactly what you need. Robust – The Watchgas SST1 is IP rated 67-68 Warning – The Watchgas SST1 complies with all industry standards. High and low alarms can be configured and automatically updated via the device or dock. Reliable and user-friendly Easy to use, one-button operation. 3-point alarm system, audible, visible and tactile signals. Easy and simple to wear with the sturdy crocodile clip. (Pocket, belt, helmet.)