Tuning equipment help

hello guys i am looking to buy a portable wideband sensor and and knock detection sensor kit to start out with here is a picture of the wide band i was thinking of buying and this link if of the knock detection i was thinking of just let me know i honeslty have no idea what a good brand and whats not lol

http://www.importimageracing.com/haltech-knock-sensor-for-basic-knock-ears-kit-ht070103-universal.html?gclid=CjwKCAjwhYLLBRBIEiwAtFeEDxluY7jv4CEFEdz22HrPriAUx8Yc-clhThmFxDwPBcCpg-7woaePIxoCVS0QAvD_BwE

Note the webpage for the knock "device" that you have linked above is a bit misleading - it is actually just a replacement sensor, not the whole "knockbox" detection kit. The "Knockbox" is a pretty decent device but more like USD700, not 70.