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The heterodyne wave meter "Ч4-1" from 1951 was produced by Chervonograd Equipment Plant. HS serves to check the graduation of the frequency of transmitters and receivers operating with continuous oscillations. The range of operating frequencies of the device: 0.125 ... 20 MHz. Measurement error 0.01%. Volometer "P4-1" was produced in four versions under the numbers 526, 526U, 527, 528. Option No. 526 is designed for work in the field and is powered by batteries and dry batteries. Option number 526U universal and is designed to work in the field and laboratory conditions. Options No. 527 and 528 practically do not differ from each other and are designed to work in stationary conditions. All devices have a similar external design, differing only in small rearrangements of the knobs on the front panel. Instructions for working with a specific instrument and a calibration book are attached to each instrument, from which it is easy to determine the necessary frequency during measurements.