Replacement PH Probe

[byee]

I have an American Marine Pinpoint pH Monitor which requires a replacement PH probe.

Instead of spending $50 for a new replacement for a LFS, has anyone ever purchased replacement PH probes from eBay?

Similar to this one which sells $8USD?

http://www.ebay.com/itm/PH-Electrode-Probe-BNC-Connector-for-Aquarium-PH-Control-Controller-Meter-Sensor-/360798869725?pt=LH_DefaultDomain_2&hash=item540149d8dd

What's your opinion?

[intarsiabox]

I never tried one but that's a heck of a deal if they are accurate.

[michaelis88]

dont look reliable