Engineered for professionals who demand accuracy, safety, and reliability, the FORENSICS DETECTORS FD-4D is a compact 4 gas monitor that arrives factory calibrated to USA NIST traceability in Los Angeles, California. High-fidelity electrochemical sensors for O2, CO, and H2S pair with a catalytic sensor for combustibles (LEL) to deliver rapid <30-second response and fine resolution across practical ranges: O2 0–30% (0.1% res), CO 0–999 ppm (1 ppm res), H2S 0–100 ppm (1 ppm res), and LEL 0–100% (1% res), with accuracy better than 5% F.S. Adjustable audio, visual, and vibration alarms ensure unmistakable alerts, while zero and span calibration options maintain long-term confidence. Built tough with high-strength ABS and an anti-slip rubberized feel, this water-resistant, dust-proof, and explosion-proof instrument carries ATEX certification Ex ib IIC T4 Gb for dependable use in challenging environments from 0°F to 122°F and <95% RH. Weighing just 9.6 oz and measuring 2.6" × 1.2" × 5.1", it’s an ideal personal gas monitor for confined space entry, maintenance, oil and gas, utilities, and industrial safety. The rechargeable, battery-powered design delivers over 24 hours of working time, and sensors offer 2–3 years of life with a 12-month recommended calibration period. In the box: 4 gas monitor, English manual, USB charging cable, calibration cover, metal belt clip, and NIST calibration certificate—backed by a 1-year manufacturer warranty. - Brand: FORENSICS DETECTORS FD - Type: Gas Detector - Color: Yellow - Power Source: Battery Powered - Model: FD-4D - Unit Quantity: 1 - Unit Type: Unit - MPN: 00001676 - UPC: N/A - Item Number: 00001676