I have both a Polytune (pointless for bass but good for guitar I guess) and Unitune, but the Peterson StroboClip HD is by far my favourite. Not cheap but shop around and it can be found for under £50, not at Andertons, however:
https://www.andertons.co.uk/peterson-stroboclip-hd-clip-on-strobe-tuner-pt-stcliphd?utm_source=google&utm_medium=organic&utm_campaign=surfaces&gclid=Cj0KCQiA-K2MBhC-ARIsAMtLKRsUrjz-CdpTJXOeCd8lke5JhQaqsoQJY_kVAvUDoXlTylbwmjYMbFkaAiGdEALw_wcB