Telephone Butt Set Tempo

See data sheet here

Product Details
The Greenlee Tempo TM-500 telemate telephone test Set is used to solve problems of analogue telecommunication circuits. The TM-500 works without battery (convenience of line powered) operation. The TM-500 not only works in handset mode but can be used with the headset which is included for easy usage.

Over voltage and over current protection
Tone or pulse dialling available
Mute function available
Luminescent keypad
Storage of up to 10 telephone numbers
Last Number Redial option available
Impact resistant
Flash to generate a timed break recall