Profile: Caltest Instruments, Inc. is a provider of smoke meters. Our smoke meter is a diesel exhaust smoke test system and it includes digital signal processing software that enables it to display & print out exhaust smoke opacities, densities & their test averages for rapid diagnostic maintenance testing. Our parts and accessories include adapters, batteries, printers & papers. Our smoke meter sets include telescoping poles for pipe, rugged and padded carrying case that stores, slide doors for soot cleaning, double chambers to block soot & four hinged magnets to hold sensor on stack.