Ok it isn't really a meter, but a quick and easy LED indicator for an approximate match.
The maker's spec:
Name: SWR Meter
Material: metal
Using frequency: 3-30MHMz
Maximum power: no more than 100W
Insertion Loss: <0.3dB
VSW: <1.2
Interface: M female
Item size: 25 * 25 * 50mm / 0.98 * 0.98 * 1.97in (not counting M base)
Package size: 80 * 30 * 50mm / 3.15 * 1.18 * 1.97in
Package weight: 85g / 3.00ounce
Maker? Seems to be sold under many brands, maybe mostly same manf as construction details look remarkably similar.
I got it for QRP / mobile / portable operation. So, does it work? Yes, but to be clear, the connectors are SO-239 and despite the label, if less than 10W signal, the lights are not bright but readable. Does it do QRP 5W? Yes, at a pinch, but not bright. Does it give a quick and easy 20W indication of a magloop tune? Yes, with a Xiegu G-90. If the G-90 is angled up for better panel view, the antenna connection doesn't give much room for this indicato…login to view the rest of this post