Kern precision laboratory balance kern pcb 250 3 the kern pcb 250 3 is a precision laboratory balance that is highly accurate fully programmable and comes with a range of advanced features for precise record keeping and weighingthe balance is suitable for weighing and counting even the smallest parts the balance is supplied with an 81mm weighing platea built in recipe function makes determining the exact measurements of a mixture as easy as possible this mode will allow you to weigh the