VIDEO: Larry Chapman, Chapman Metering, about the
dangers of 480V metering and TSTM VT-Pack solutions

See how easy it is to install a VT-Pack. Click the links below to watch installation videos.

Home of the VT-Pack.
For safer, more reliable metering.

TSTM (Two Sockets – Two Meters, Inc.) is dedicated to improving metering function, installation, cost and safety across the electricity industry.

Our initial products were designed to allow metering all poly- and single-phase installations using only two – and sometimes one – 9S meter. However, with this efficiency came increased reliability, safety and ease of installation. These important benefits have eclipsed our initial technical advances.

We’re out to make your work easier, less costly, and much, much safer.

• Safer Voltage
• Protection from Transients
• Better Design and Solid Construction
• Protection of Equipment
• Reduce or Eliminate Flashover
• Easy Installation
• Save Money
• Totally AMI Compatible

Single Point Grounding Demo

TSTM VT Pack Warranty