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12.Without regular recalibration, the results may not be accurate. Every CTD504 is calibrated right after production. See “Warranty and Recalibration” for details.
13.Keep the CTD504 away from sunlight and dusty places.
Important Notice:
The CTD504 does not require a probe cover during use. It is important to clean and disinfect the CTD504 before and after each use. See “Cleaning and Disinfection” for details.
For measurement:
•When asleep, pressure on the ear may cause
•Clean your external ear before measuring. To ensure an accurate result, keep your ear free from obstructions or excess earwax.
•The measuring results from the left and right ears may differ slightly. We recommend measuring in the same ear.
•Before measuring, the user and the CTD504 should be in a steady room temperature for at least 30 minutes. The user should also rest for 30 minutes after exercising.
HOW TO OPERATE
1.Press the /O button. The LCD screen displays all digital segments.
2. If the CTD504 has saved past results, the LCD screen automatically displays the latest result.
3.When 
or 
fl ashes with a short beep, the CTD504 is ready to use.
1.To improve accuracy, follow the illustrations below. For adults, pull the ear up and back. For infants and children, pull the ear back.
Adults | Infants and Children |
2. Fit the probe tip into the ear canal, and then press the START button. Release the button and wait a few seconds
until you hear a long beep.
3.Take the CTD504 out of the ear canal. The LCD displays the
latest measuring result. Without any operation, the CTD504 automatically shuts off after 1 minute.
Note: Before
HOW TO SWITCH FROM 
TO 
(FROM 
TO 
).
1. In 
starts fl ashing, release the button.
2. Press the START button again to switch from 
to 
.
3.Wait until the CTD504 automatically shuts off and restarts. It is now ready to use.
RECALL MEMORY
1. In
2. Press the START button repeatedly to scroll through all 12 stored results in a loop.
ERASE MEMORY
1.While holding the START button, press and release the /O button. The CTD504 starts up.
2.When the LCD displays the previous measuring result, release the START button.
3.To check memory erasing, turn the CTD504 off, and enter Memory Recall Mode again.
BATTERY REPLACEMENT
•
fl ashes: You can still measure, but the accuracy may not impaired.
•
lights or no reaction at all: Change the battery as soon as possible. Note: Change the battery away from small children and any source of heat.
1. Press the upper part of the battery cap to unlock it.
2. Insert the tip of a tool into the gap at the side of the battery compartment. Remove the
3. Insert a new CR2032 lithium battery into the CTD504, according to the polarities in the fi gure. Push it fi rmly into place with a “click”, then replace the cap.
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