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The radio constructor "Start TsCh-1" (Digital Frequency Counter) has been producing the Riga software "Switch" since 1989. The radio constructor "Start ChTs-1" is intended for children aged 14 years and older who are interested in building radio equipment. The kit contains components, parts and structural elements from which a measuring device can be assembled and adjusted to measure the frequency of arbitrary electrical signals. The designer has two options for assembling the device: a digital frequency meter and a digital frequency meter with an output frequency of 1 or 2 Hz. The frequency meter is the main instrument of the instrumentation complex for a radio amateur, consisting of the following sets: power source IP-1, voltage-frequency converter PNCH-1, AF generator GZCH-1, RLC meter I-1 power supply with a logical probe IP-2. All measuring instruments assembled from these sets have the same dimensions and design and can be mechanically and electrically combined into a complex. Frequency meter characteristics: Measured frequency range from 10 Hz to 1 MHz. The input voltage range is from 100 mV to 50 V. The number of displayed discharges is 6. The measurement error is no more than 0.5% -1 the sign of the least significant digit. Measurement time - 1 s. Display time - 1 s. Input resistance, not less - 1 MΩ. Supply voltage - 9 V. Current consumption, not more than - 100 mA.