I purchased two of these meter kits for inclusion in a custom stereo power amplifier to give a visual indication of approximate power output of the amp during operation. Although my implementation of the PPM/VU circuitry is a bit different than the apparent intent or focus of JLM Audio's general product line - audio recording technology -a meter is a meter and these meters are very innovative designs. Most notable is the inclusion of a dual function PPM metering as well as VU metering in the same display, using bi-color bar LEDS to differentiate the two simultaneous functions. In practice, the bi-color display results in three actual colors, each conveying different information about the input signals. The peak-hold feature, with a well defined and clearly visible decay function, adds to the esthetics of the display as well as conveying the intended metering information of this very clever design. I highly recommend this kit both for its usefullness as well as a very professionally executed and supplied kit. Assembly is easy and straightforward, calibration is simple and the circuit works, glitch-free, after assembly. I do have to add a caveat to this review - although this is the first electronics kit I have ever purchased, I am certainly not a novice audio hobbyist. I worked in the electroncs field professionally and as a audio enthusiast as a hobby for close to 50 years before retirment. Consequently, I found the assembly of the kits to be simple and straightforward to accomplish. However, I think that this kit might present some challenges for an amateur hobbyist - not in the assembly of the kit but in its intended purpose and implementation. In summation, this is a clever and innovative circuit with a well executed design and flawless performance. Jim Parson Silver City, NM (USA)Jim Parson (Sun Feb 05 2012, 01:38 am )