want advice on buying a denistometer

I'm at the point now where spending more on camera equipment - lenses specifically - would be a waste of time until I get a handle on my development times and e.i.

So I'm going to buy a densitometer.

Anyone out there have some wise words on buying my first and hopefully only densitometer? What should I look for and what should I avoid. Any thoughts on price would be appreciated.

thanks!

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