capacitance meter not working

[aliyesami]

I bought this capacitance meter CAP1500 based on the reviews but i cant get it to work .its giving me wrong values, I think because the knob called ADJ.
whats the function of this ADJ knob ? please see
the picture .

 

[MrCarlos]

Hello aliyesami

Have You the user manual for this capacitance meter?
The manual says to what that knob.
Also how to use it.

 

[hobbyckts]

Refer manual

 

[MrCarlos]

Hello aliyesami

Sorry, I did not reply to your original question:

whats the function of this ADJ knob ?.

This knob is to adjust to zero reading when the instrument does not have anything connected to the probes.

 

[Audioguru]

Its ADJ knob seems to only null its stray capacitance that is much less than 200pF. It should say to do it when the leads are connected to the meter.
I cannot null the stray capacitance of my Fluke multimeter and without its leads it shows 150pF. With its leads it shows 200pF that changes if I move close or move away from it.

If it is inaccurate at higher capacitances then the manual says to replace its BADDERY. When the battery voltage is low it shows a symbol of the BADDERY on its screen.