Labtronix has been in business for nearly 30 years now. They service many of the labs in Vanderbilt University and Water and Waste Water Plants in TN and KY. They provide regular calibration and maintenance programs, equipment and laboratory supplies (chemicals, beakers, gloves) sales, and have many years of experience in repairing equipment efficiantly.
Pros: quick, knowledgable, friendly, honest, and good prices
Cons: hmmmm.... can't think of any.