We live in the real world here at PK Safety. We know you need to fulfill OSHA requirements for 4-gas monitors for workers performing confined space entry. We also know price is a consideration for every business. Luckily there is a solution. The BW GasAlert Micro Clip XL is the perfect hybrid of affordability and rugged performance. This monitor is a step forward for BW as they have worked on extending the battery life of their confined space gas monitors. The Micro Clip XL can be operated for up to 18 hours on a single charge. Charging time for this monitor is only 4 hours. The Gas Alert Micro Clip XL has sensors for hydrogen sulfide (H2S), carbon monoxide (CO), oxygen (O2), and the lower explosive limits (LEL) of a range of combustible gases. These are the standard requirements from OSHA for confined space entry. BW Honeywell has been making reliable personal gas detectors for over 30 years. As one of the largest distributors of BW gas monitors, we're able to provide some of the best pricing on the web. But gas monitors are an ongoing proposition. Depending on the scope of your work, you may need calibration services from our factory-trained technicians, calibration gas on an ongoing basis (make sure to check your gas expiration dates as the gas will degrade over time), and other supplies. At PK Safety we aren't selling toe nail polish and inflatable pool toys. Safety is our only business. If you have a questions about which BW monitor is best for your specific application, a call to our US-based customer service team will not be an exercise in patience or communications skills. You'll get the information you need to make the right decision both in terms of safety and the bottom line. You can reach them at 800-829-9580.