CQV-SWR120 power meter and PSV meter with alarm
The CQV-SWR120 is a digital power and standing wave ratio meter (PSV) in the range of 1.8MHz-54MHz. Full color 240 x 240 pixel LCD display shows direct performance, reflected performance, power directed to the antenna, power transfer efficiency, PSV and battery voltage. A high PSV is also indicated by an audible alarm, whose threshold you set.
Mini DIGITAL PWR / SWR meter review by Paľ OM0ET (in English):
The power supply is a built-in 3.7V 1000mAh battery, which can be recharged via a regular mobile phone charger with a USB-C connector (5V/1A). The CQV-SWR120 has a battery saving option, i.e, the meter can turn off when idle and turn on when it detects RF power. The function of protecting the battery against undervoltage is a matter of course.
However, while small boxes are on the market 88 x 63 x 38mm. So it is a small device, which will be supplemented by an antenna tuner, amplifier or transceiver without a built-in meter. The current price is around 50 €.