Looking for strobe disc

[King_Julian_S]

Hi all.
Anyone know where I can find a decent strobe disc or methods that can be used on various tables to verify at least 33.3 as accurately as possible ?

Tx...

 

[Waterhond]

 

[Waterhond]

 

[King_Julian_S]

 

[placebo]

 

[King_Julian_S]

 

[placebo]

 

[King_Julian_S]

 

[placebo]

 

[King_Julian_S]