Is There A Device For Home Use That Can Measure How Low The Bass In My Speakers Is?

It’s not just how low, it’s also how equal in level all frequencies are top to bottom, IN YOUR ROOM.

I have test lp's and cds, this, my favorite test cd has 29 specific 1/3 octave tones.

then you get an inexpensive Sound Pressure Meter (with a tripod screw fitting)

mount on tripod set at seated ear height at your listening position.

make a chart, (I made enlarged copy of the booklet’s track listing)

pick 1,000 hz for example, and adjust volume to your 'normal loud'

now select specific tracks and write down what you are getting.

it can help you refine speaker location and toe-in, see the measured results.

In my case, I have L-Pads to adjust 'Presence' the mid horn output to the woofer output, and L-Pad to adjust 'Brilliance' the tweeter horn to the mid horn. Both sides. Takes quite a while to get it right, but when you do, oh baby!

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If you cannot find that test cd at a decent price, send me a private message.

I did this by ear for so many years, the inexpensive SPL meter and test tones are a treat.

Any suggestions if a CD player is not available?

An SPL meter measures loudness in the units of dB. Is there a similar handheld device which measures frequency in Hz?

You don't need a CD player or any test CDs or files. To measure how low the Hertz you need a calibrated test microphone and software to use it. It can also show you how high the SPL before to much distortion. The OP isn't asking how loud his bass goes but how low in frequency.

Usually you have a source with the Hertz that you choose to test and use the dB as the test result.  There are cell phone and tablet apps to do this measuring.  Improved results can be had if a separate microphone is acquired.

The Velodyne SMS -1

Its a combo room analyzer, X-over and EQ. It’s designed to produce bass sweeps that you can see on a video monitor The idea is to use the X-over and EQ sections to get a smooth handoff to a subwoofer, but the room analyzer will show only the bass response of your main speaker (below 200 hz) if there’s no subwoofer in the system