Advanced Research Instruments Corp. has released a series of low-level-current amplifiers for photomultiplier tubes (PMTs) and photo- cells. The PMT-4 covers an input range of 10-7 to 10-5 A/V, and the PMT-5 has a range of 10-12 to 10-6 A/V. The PMT-5R for computer applications has remote-controlled gain with selection by three transistor-transistor logic lines. The PMT-5 and PMT-5R are specifically designed for detection of currents in the picoampere range. These current amplifiers are suitable for applications in spectroscopy, PMT or photodiode signals amplification, and low-light-level detection.