Electrical – What does “AC frequency response : (60-1000)Hz” mean for multimeters

I'm considering to buy a multimeter. The following is its specs as listed at Amazon:

Size:KT6666

Featuring a wealth of functions, it is intended for troubleshooting various electrical issues arising in household, industrial and automotive devices.

Features:

Fast, accurate measurements at 3 readings per second update speed;

Backlit LCD Screen with perspicuous readings display;

Overload protection in all ranges;

Heavy duty build, suitable for indoor & outdoor use;

6000 counts display with TRMS , Large LCD size at 6.2*3.8CM

Rubber holster to protect the meter dropping when use.

Multi meter Specifications:

• DC Voltage: 600mV ±(1.0%+10)

• DC Voltage : 6V/60V/600V/1000V ±(0.5%+3)

• AC Voltage (True RMS): 600mV ±(3.0%+3)

• AC Voltage: 6V/60V/600V/700V ±(1.0%+3)

• DC Current: 600uA/6000uA/60mA /600mA /10A/20A ±(1.5%+3)

• AC Current: 600uA/6000uA/60mA /600mA/10A/20A ±(1.5%+3)

• Resistance: 600/6k/60k/600k/6M/60 MΩ ±(0.5%+2)

• Resistance: 60MΩ ±(1.5%+3)

• Temperature: -20~1000℃ (-4~1832℉) ±(1.0%+5)

• Capacitance: 10nF ±(5.0%+20)

• Capacitance: 100nF/1uF/10uF/100uF/1000uF ±(2.0%+5)

• Capacitance: 10000uF ±(5.0%+5)

• Frequency:99.99/999.9/9.999k/99.99k/999.9k/9.999MHz,±(0.08%+2)

• Duty Cycle:1-99%,±(0.8%+2)

• Range Selection: Auto / Manual Ranging

• Max Display: 6000 counts

• Sample Rate: 3 times/s

• Diode test: Yes

• Continuity buzzer: Yes

• Low battery indication:Yes

• Data hold:Yes

• Auto power off: Yes

• Restorable Fuse protection: Yes

• Shock proof protection: Yes

• AC frequency response: (60-1000)Hz

• Battery: 2×1.5V (INCLUDED)

• Dimension: 180*90.5*45mm

• Product Net Weight: 343g

• Working environment: 0~40℃, relative humidity < 80%"

From:

https://www.amazon.com/KASUNTEST-Multimeter-Capacitance-Resistance-Transistor/dp/B01L9F09NM/ref=s9_simh_gw_g469_i1_r?_encoding=UTF8&fpl=fresh&pf_rd_m=ATVPDKIKX0DER&pf_rd_s=&pf_rd_r=QCNF28ZDGZC93PVZTEE3&pf_rd_t=36701&pf_rd_p=1cded295-23b4-40b1-8da6-7c1c9eb81d33&pf_rd_i=desktop

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Question:

This meter is advertized as a true RMS multimeter. What does "AC frequency response (60-1000)Hz" in the specs mean? Is it this meter's sampling rate to calculate RMS? If so, how does it compare to other true RMS multimeters'?

After writing the above, I just noticed that there's "Sample Rate: 3 times/s" in the specs. Is this the sampling rate to calculate RMS? Isn't this pretty low?