We provide exemplary protection and security service because of our highly trained guards. Our professionals are proven to be level-headed, dependable, and effective in all situations.

VLF Designs specialize in the manufacture of complete high performance crystal stabilized analog telemetry systems for short period seismic monitoring. We can provide individual components or complete turn-key systems. VLF also supplies custom transient suppression equipment. We design solar charge regulators and battery management systems to provide clean reliable power for both analog and digital seismic monitoring systems. VLF is willing to customize any of our designs to your specifications or design new hardware to meet your requirements. Since 2001 we have partnered with Eentec to provide their line of rotational, broadband and acceleration sensors. We integrate their sensors and others into custom packages for borehole applications. VLF serves both domestic and international clients

We have the latest and greatest technology out there. With our ASE Certified Master technicians you are sure to be back on the road in no time. We quote you prices that are fair and affordable. Give us a call, we'll give you an estimate and get you back on the road.

SirVent Chimney & Venting Service STL is locally-owned, experienced, educated, and here for folks all throughout St. Louis and Southeast Missouri. If you're in need of an inspection or sweeping, don't hesitate to reach out! We also handle a wide range of chimney repair services. These include relining, tuckpointing, masonry repairs, leaky chimney repair, replacement parts, and more. Ready to work with the go-to chimney company throughout the area? Call us at 877-765-1765 today.