We mainly sell the MidWest Brand test kits but will sell Watts as requested. Buy with confidence from an authorized repair and calibration center.
The most popular model is the MidWest 845-5 and we maintain stock on this model. They also make it in a 3 valve and 2 valve configuration. The 835 gauge is the same gauge as the 845-5 but comes in a rugged carrying case that allows the gauge to be mounted into the case and provides the option to remove it for convenience. The 830 is designed to stay in the case.
Many of the gauges that are out there are made by Mid-West for the manufacturers like Apollo and Wilkins but have been made for Febco and Flomatic as well as other smaller distributors.
Mid-West offers a 5 year warranty and most others are only a year warranty. For the money the Mid-West kit is my choice of test kit!