- Take a full system snapshot quickly and easily with the JL3KH6 Charge and Air Test Kit. This kit consists of (2) pressure probes, (2) pipe clamps and (2) psychrometers in a quick access padded case. All measurements can be sent up to 1000 ft away directly to your mobile device with the Job Link® system mobile app. Each tool is designed for agility and speed. The pressure probe fits into tight spaces. The pipe clamps use the new Rapid Rail™ sensor design delivering accuracy, speed and agility, even on the most awkward pipe configurations. The psychrometers' flexible narrow probes and configurable magnet make it easy-to-measure supply plenums, ducts and elevated registers. Do more with Job Link® probes!.