The Triplett 3022-NIST Model 310-C is a hand-sized analog multimeter with all of the versatility and performance of larger, more expensive bench-size models. It offers a diode overload protection against damage to the meter movements caused by accidental overloads. A fuse is used to protect the RX1 range. The fuse and batteries can be easily replaced by removing the back cover. Small enough to be carried in your tool box, glove compartment, brief case, or shirt pocket, the Model 310 features 20,000 ohms per volts DC sensitivity and 15,000 ohms per volt AC. Versatility and readability have not been sacrificed in order to provide a portable VOM. This model has 18 different ranges that can be easily read on only 3 clearly defined scale areas and a polarity reversing switch. A single selector switch allows you to switch easily from range to range and function to function.