Meta Targa SR2
Price: £99.99 Sensors/warning: 2/beep
Unusual in not requiring bumper holes, this had a plastic bracket to hold a conventional rectangular number plate and the two sensors. Adjustments include offset for plates that aren't central, and a variety of mounting positions to allow for different heights. It worked well on all the tests, particularlythe bike whichit 'found' at 0.8m. There's no visual display, butthe Halfordsprice includes installation - a definite plus.