Check the listing for details. Thermal Engineering Co. Super Vak-Check II M# 14571 Leak Detection System. Condition: Used. Listed at 75.00 USD. Thermal Engineering Company of Toledo, Ohio model 14571 Super Vak-Check 2 leak detection micron meter. This device has been tested and appears to work. Calibration to the sensor was successful, tested with AC power and battery power. Very clean inside looks to be well maintained and stored inside. There is a new version of this tester on the market. here is your chance to get a sweet deal on what brand new is costing $1600.