The Triplett Model 310-TEL is a handy hand-sized VOM with all the versatility and performance of larger, more expensive bench-size models. It offers diode overload protection against damage to the meter movement 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-TEL allows you to have 20,000 ohms per volt DC and 5,000 ohms per volt AC sensitivity wherever you need it.