![Model 460 | Air Meter/Draft Gage is popular for servicing air conditioning, heating and ventilating equipment. Gives consistent, accurate results with no tedious calibration. | Dwyer Instruments Model 460 | Air Meter/Draft Gage is popular for servicing air conditioning, heating and ventilating equipment. Gives consistent, accurate results with no tedious calibration. | Dwyer Instruments](https://www.dwyer-inst.co.uk/images/Medium/460_Kit_1000x1000.jpg)
Model 460 | Air Meter/Draft Gage is popular for servicing air conditioning, heating and ventilating equipment. Gives consistent, accurate results with no tedious calibration. | Dwyer Instruments
![Series DH3 | Differential Pressure Controllers are available in 3-in-1 instruments that have a digital display gage, control relay switches, and a transmitter with current output. | Dwyer Instruments Series DH3 | Differential Pressure Controllers are available in 3-in-1 instruments that have a digital display gage, control relay switches, and a transmitter with current output. | Dwyer Instruments](https://www.dwyer-inst.co.uk/images/addtl/DH3_SS_TopLeft_PA_1000x1000.gif)
Series DH3 | Differential Pressure Controllers are available in 3-in-1 instruments that have a digital display gage, control relay switches, and a transmitter with current output. | Dwyer Instruments
![Series 475 | Intrinsically Safe Handheld Digital Manometer measures air and natural gases. Applications include field calibration of other instruments, monitoring or troubleshooting HVAC systems. | Dwyer Instruments Series 475 | Intrinsically Safe Handheld Digital Manometer measures air and natural gases. Applications include field calibration of other instruments, monitoring or troubleshooting HVAC systems. | Dwyer Instruments](http://www.dwyer-inst.com/images/addtl/475_1_FM_1000x1000.gif)
Series 475 | Intrinsically Safe Handheld Digital Manometer measures air and natural gases. Applications include field calibration of other instruments, monitoring or troubleshooting HVAC systems. | Dwyer Instruments
![Series 647 | Wet/Wet Differential Pressure Transmitter monitors pressure in air/liquid flow systems. Used in flow, process control, HVAC automation, and pneumatic systems. | Dwyer Instruments Series 647 | Wet/Wet Differential Pressure Transmitter monitors pressure in air/liquid flow systems. Used in flow, process control, HVAC automation, and pneumatic systems. | Dwyer Instruments](https://www.dwyer-inst.co.uk/images/addtl/647_600x600.gif)
Series 647 | Wet/Wet Differential Pressure Transmitter monitors pressure in air/liquid flow systems. Used in flow, process control, HVAC automation, and pneumatic systems. | Dwyer Instruments
![Series 668 | Compact Differential Pressure Transmitter is compact, lightweight, and features reverse-polarity protection. Units also feature reverse-polarity protection. | Dwyer Instruments Series 668 | Compact Differential Pressure Transmitter is compact, lightweight, and features reverse-polarity protection. Units also feature reverse-polarity protection. | Dwyer Instruments](https://www.dwyer-inst.co.uk/images/addtl/668_600x600.gif)
Series 668 | Compact Differential Pressure Transmitter is compact, lightweight, and features reverse-polarity protection. Units also feature reverse-polarity protection. | Dwyer Instruments
![Dwyer Instruments Ltd | Rate Master flowmeters, Magnehelic pressure gages, Photohelic switch/gages, Hi-Flow valves, transmitters, pressure switches Dwyer Instruments Ltd | Rate Master flowmeters, Magnehelic pressure gages, Photohelic switch/gages, Hi-Flow valves, transmitters, pressure switches](https://images.findtheneedle.co.uk/findtheneedle//products/6304137.jpg)
Dwyer Instruments Ltd | Rate Master flowmeters, Magnehelic pressure gages, Photohelic switch/gages, Hi-Flow valves, transmitters, pressure switches
![Series AT-2000 | ATEX/IECEx Approved Magnehelic® Differential Pressure Gages combines the popular Magnehelic® line with a flameproof enclosure to extend usage to hazardous locations. | Dwyer Instruments Series AT-2000 | ATEX/IECEx Approved Magnehelic® Differential Pressure Gages combines the popular Magnehelic® line with a flameproof enclosure to extend usage to hazardous locations. | Dwyer Instruments](https://www.dwyer-inst.co.uk/images/Medium/AT-2000_1000x1000.jpg)
Series AT-2000 | ATEX/IECEx Approved Magnehelic® Differential Pressure Gages combines the popular Magnehelic® line with a flameproof enclosure to extend usage to hazardous locations. | Dwyer Instruments
![Series RH-R | Humidity/Temperature Transmitter is an ideal transmitter for applications where space is limited. Ideal for environmental chambers, rubber bladder burst detection, and air handler applications. | Dwyer Instruments Series RH-R | Humidity/Temperature Transmitter is an ideal transmitter for applications where space is limited. Ideal for environmental chambers, rubber bladder burst detection, and air handler applications. | Dwyer Instruments](https://www.dwyer-inst.co.uk/images/addtl/RH_R_600x600.gif)
Series RH-R | Humidity/Temperature Transmitter is an ideal transmitter for applications where space is limited. Ideal for environmental chambers, rubber bladder burst detection, and air handler applications. | Dwyer Instruments
![Series 2-5000 | Minihelic® II Differential Pressure Gage combines clean design, small size, and low cost. Latest in design. Easy to read and can safely operate at total pressures up to 30 Series 2-5000 | Minihelic® II Differential Pressure Gage combines clean design, small size, and low cost. Latest in design. Easy to read and can safely operate at total pressures up to 30](https://www.dwyer-inst.co.uk/images/Medium/2-5001_Front_1000x1000.jpg)