Thank you for purchasing the Boston BTU-300 digital micro clip... 5. To change calibration (reference ...

Thank you for purchasing the Boston BTU-300 digital micro clip chromatic
tuner with sound generator. Before you begin using your new tuner, please
read this manual carefully and use the tuner as directed. After you have read
the manual, keep it in a safe place for future reference.
Do not open the casing for any reason as this may cause short circuit or
malfunction of the product.
Do not apply excessive force to the product. In the event of the product
suffering breakage, be careful not to damage yourself with the broken
Do not put in any liquid nor foreign object.
Keep unit away from dust, extreme temperatures and humidity.
When the unit is not in use for a long period of time, remove the battery
to prevent leakage.
This Boston digital chromatic tuner has been constructed using state of the art
technology. The circuitry has been tested for reliability by our staff of qualified
technicians under performance conditions. Simple care and maintenance will
provide long life. This unit is powered by a CR2032(3V) lithium battery. When
the back light of the LCD or LED indicator light becomes weak in colour,
replace the battery in order to achieve the best tuning results.
5. To change calibration (reference pitch), press CALIB (7). Reference
pitch can be varied within the range of 430Hz to 450Hz with 1Hz step
of increment. Keeping the button pressed causes automatic increment
(reference A4 = 440Hz). Result is indicated at position D.
6. When a single note is being played on an instrument, its pitch notation is
shown at position E. Set the instrument so that a notation requiring tuning
is indicated. The meter needle at position F becomes actuated along with
an indication of a notation. When sound is high pitched or low pitched,
the LED on the assist indicator (8) lights up in red. Just tuning is obtained
when the LED turns to green and the needle at position F with the central
position 0 Cnet.
tuning by means of sounding a reference tone)
1. Turn on the power and select chromatic (C), guitar (G) or bass guitar (B)
mode with the MODE button (4). The result is indicated at position A and
cannot be changed after setting the sound mode.
2. Select the sound mode by pressing the TUNER/SOUND button (2).
The buzzer will make a reference tone. In chromatic mode (C), select a
tuning scale with the KEY button (5) and the result is indicated at position
C. Four kinds of scales, namely C, B, E and F major scales can be
selected. Usually the C major scale is used for tuning guitar etc. Guitar
(G) and bass guitar (B) are set on the C-scale. This cannot be changed.
3. To change calibration (reference pitch), press CALIB (7). The pitch can
be incremented 1 Hz step at a time within the range of 430Hz to 450Hz.
It can be increased automatically by holding down the button. The result
is indicated at location D. Reference A4=440Hz.
4. To raise the reference tone produced by the tuner, press the FLAT (6)
button. To lower the reference tone, press MODE (4). Select a note
requiring tuning and set your instrument to the oscillated tone.
Be sure to dismount the unit from the instrument after tunings is finished to
avoid the threat of damaging the instrument.
power switch (ON/OFF)
tuner/sound selector button (TUNER SOUND)
vibration sensor/microphone selector switch (VIB/MIC)
mode button (MODE), key note (NOTE) down
key button (KEY)
flat button (FLAT), key note (NOTE) up
calibration button (CALIB)
assist indicator
microphone (MIC)
Press the Power switch button (1) to turn on the power. A previous tuner
setting of the tuner will appear. To turn off the power, press the button again.
Otherwise, the power will be turned off automatically 3 minutes later if the
powered unit has been left unattended.
1. To select either vibration tuning or microphone tuning, set the VIB/MIC
switch (3) to VIB (down) or MIC (up). The vibration sensor provides
tunings with no influence of surrounding noise.
2. Select chromatic (C), guitar (G) or bass guitar (B) mode by pressing the
mode button. The selected mode is indicated at position A.
3. In the case of chromatic tuning (C), select a tuning scale with the KEY
button (5). The result of this selection is indicated at position C. Four
kinds of scales (namely C, B, E en F major scales can be selected.
Usually the C major scale is used for tuning guitar etc. Guitar (G) and
bass guitar (B) are set on the C scale. It cannot be changed.
4. Set the standard tuning or a lower note tuning with the FLAT button (6).
Each time pressing the FLAT button, semitone= , two semitones=,
tree semitones=, four semitones= are sequentially indicated at the B
position. Absence of any -indication shows the standard tuning.
The LCD display becomes dark as battery life deceases. Cut the power
supply and replace the button battery CR2032 with a new one. Pay attention
not to confuse its polarities. When the unit is not used for a long period,
remove the battery.
Power source
Automatic power OFF
: button battery CR2032 (3V) 1 piece
: Power is cut off after the unit is left unattended for
about 3 minutes
: Backlight LCD display
: 12 note equal-tempered
Measuring range
: A0 (27.5Hz)~C8 (4186.01Hz)
Measurement accuracy : +-1 cent
Calibration range
: A4=430Hz~450Hz, 1Hz step
Tuning scale
: C major, B major, E major, F major scales
Assist indicator
: 1LED, in tune = green, / #=red
Sound detection
: Vibration sensor, built-in microphone
Dimensions tuner body : 57*35*14mm
: approx. 41g (including battery)
mark for European standards
This is to certify that the chromatic tuner fully conforms to the protection
requirements of the following EC Council Directives on the approximation of
the laws of the member states relating to: 89/336/EEC, 9368EEC, EN55022,
EN61000-6-1, EN61000-6-3.
*** appearance and specifications are subject to change without notice for improvement – E&OE ***