Serial # 034-764 

Paid $1500 new at the time. 


The Model R1L-B is a digital Microohmmeter / Bond Tester with full scale ranges from 2 mΩ to 20 Ω. The instrument utilizes the four-terminal, Kelvin technique to eliminate errors caused by the resistance of the leads. The resistance reading is displayed on a 3½ digit liquid crystal display on the front panel. An over-range condition is indicated as a "1" followed by three blank digits (the decimal point is also displayed in its normal position for the range selected).

This is a range-selection instrument, with a rotary 5 range selector switch.

it has not been adjusted or calibrated in some time. However 3 of them all read the same resistance on a product we manufacture.