The ppbRAE was the top-of-the-line PID RAE Systems, a trusted brand in the industry. The PGM7240 model is made in the United States and is designed to detect VOCs. It is an essential tool for businesses and industries that deal with potentially hazardous gases with detection down to ppb levels (0.001 ppm).With its high sensitivity and accuracy, the ppbRAE PGM7240 is ideal for detecting low levels of VOCs. This PID gas detector is in excellent working condition.  It's rechargeable NiMH battery lasts over 11 hours and it includes a black rubber boot, charger and brand new alkaline battery adapter.  This was the sales demo of Chris Wrenn who was part of the team that created the ppbRAE and wrote the book on using PIDs.  This unit is very lightly used and is in great shape.  I was holding onto it for sentimental reasons but I have a bunch of PIDs and it's time to thin the herd.