Built-in PUMP + 4 Foot Probe: Best of the best. High quality electrochemical sensors Made in the UK. Oxygen (O2), Carbon Monoxide (CO), Hydrogen Sulfide (H2S) and Combustibles (LEL). USA NIST traceable calibrated in Los Angeles. Turn ON and GO. COLOR DISPLAY: Color screen and Graph functions allows for easy and intuitive operation.DATA RECORDING: Computer Data logging and alarm recording. Stores 1200 alarm records. STRONG: Robust design made of high strength ABS and Anti-slip grip rubber. Waterproof, dust-proof and explosion-proof exceeding Exib IIB T4 Gb.️ TRUST: ** 1 year limited warranty ** Arrives with calibration and QA certificate ** 100% product test and verification in the USA ** 100% quality guaranteed **
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| FD-4A | FD-4A-PUMP | FD-4S | FD-4S-PUMP | FD-600-4GAS |
| Gases Detected | CO, H2S, LEL, O2 | CO, H2S, LEL, O2 | CO, H2S, LEL, O2 | CO, H2S, LEL, O2 | CO, H2S, LEL, O2 |
| Accuracy | better than 5% F.S. | better than 5% F.S. | better than 5% F.S. | better than 5% F.S. | better than 5% F.S. |
| Response Time | <30 seconds | <30 seconds | <30 seconds | <30 seconds | <20 seconds |
| Battery & Size | Li-ion Rechargeable, 2000 mAh | Li-ion Rechargeable, 2000 mAh | Li-ion Rechargeable, 2000 mAh | Li-ion Rechargeable, 2000 mAh | Li-ion Rechargeable, 3200mAh |
| Color Screen | | | ✓ | ✓ | ✓ |
| Datalogging | | | ✓ | ✓ | ✓ |
| Graphing | | | ✓ | ✓ | ✓ |
| Pump | | ✓ | | ✓ | ✓ |
| Built-in Pump | | | | | ✓ |
| Probe Length | | 8.6-inch | | 8.6-inch | 4ft (telescopic) |
