Profile: Nilsson Electric Laboratory, Inc. specializes in corrosion instrumentation. We deal with electronic and electrical measurements. We also distribute authorized instruments. The Model 825 quartz crystal controlled current interrupter, features independent control of both open and closed time in one second increments from 1 to 999 seconds. It provides almost infinite variation of time cycles, and will accommodate virtually every interrupter application. In this the timing cycles are programmed with digital thumb wheel switches. This instrument can be synchronized with the second hand of a watch.