The TL082BCPG4 is a dual JFET-input operational amplifier from Texas Instruments, in an 8-pin PDIP package for through-hole assembly. The JFET front end delivers a typical input bias current of 30 pA, which is the main reason to pick this over a bipolar op-amp: it keeps the voltage error negligible when the source impedance is high, as in photodiode transimpedance stages, pH probe buffers, or precision integrators.
The 8-PDIP package is through-hole, which means hand-prototyping and rework are straightforward — the leads are 0.100-inch pitch and the body is 0.300-inch wide, fitting standard breadboards and perforated boards.