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Thank you for purchasing new FZONE FMT-331 Metro-Tuner, please read 
this manual carefully to make sure that you are using it correctly. Please 
keep it for future reference.

Fzone Technology Co.

Ltd

.

www

.

fzonetechnology

.

com

Overall

a

Never use alcohol,petrol or other strong chemical cleaning to wipe the 

exterior or the LCD.
b

Do not crush or strike the exterior , otherwise the unit won't be in good 

condition or has some other malfunctions.

Operation Guide

Notice for Use

Obverse Operation Display

Metro-Tuner

FMT-331                                  User

'

s Manual

a. Confirm the correct polarity when putting in a new battery.
b.Take out the battery when the unit is not in use for a long time.
c. Take off the battery and re-put it in after 10 seconds when it can't work 
well.
d

Replace with the new battery if the LCD lights show weak or unclear.

e

Dispose of the old battery properly.

Battery use

尺寸:1 0 5 * 23 3

 MM

材质:8 0

g

速 写纸

正反面印

Note 
display

A4

Note 
accuracy 
indication

Vol.

Earphone

Note accuracy 
indication needle

Stand

Battery

1.Operation guide in the tuning mode:

Function 

Operation 

Remark 

Keep  pressing  button  4 

for 2 seconds 

It will transfer between tuner and metronome. 

Transferring mode 

Press button 5 shortly 

It  will  transfer  into  TONE  generator  under  tuner's 

mode. 

Mode 

Press button 1 

Chromatic(C),Guitar(G),Bass(B),Violin(V)Ukulele(U) 

A4 

calibration 

Slide  button  2  for  being 

up or    button 3 for being 

down 

Scope:410-490 Hz 

Tuner 

Flat display  Press    button 4 shortly 

Flat display b or # 

 

Button1

Button2

Button3

Button4

Button5

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