The Platinum Series of high quality Switchboard Instruments complies with the American ANSI-C39.1 accuracy class 1 specification. Available in the 4 1/2"case size, their rugged design characteristics meet the needs of the most demanding environment applications. Engineering know-how, based on time-proven designs and worldwide use, is built into every switchboard instrument. With Byram, you always get products with proven reliability and accuracy. Models are customizable to meet customers various requirements.