It's got markings representing an imperial AND metric ruler, which retailer LoveHoney says will give you an accurate measurement of 'how deep is your love'.
I bet the Bee Gees didn't have 21st-century vibrators in mind when they wrote that song...
Anyway, the device comes in two models: the Inch Perfect is nine inches and costs £14.99, while the Inch Perfect Mini is six inches, and costs £9.99. Both are waterproof, and apparently near-silent.
LoveHoney suggests you might want to use the device to measure your partner's
foo-foo love-tunnel youknowwhat, and then "head off down to the pub to compare notes with your mates". I think they'd rather hear your views on West Ham's prospects of avoiding relegation, to be honest, but each to their own.
Oh, LoveHoney have made a suitably bonkers space-shuttle video to promote the Inch Perfect - click below to watch it in, er, action. Yes, it's safe for work.