Measurement Computing ACCUTIRE MS-4021B Quick Start Manual Download Page 1

Made in China

Specifications

Range: 5-150 PSI

Operating Temperature: 14°F~122°F 

(-10°C~50°C)

Accuracy: +/- 1% + 0.5 PSI

Power: Replaceable Alkaline LR44 1.5V Coin 

Cell (3)

Instructions

1. Remove battery tab before 1st use. Pull tab 

to remove, gauge is now ready for use.

2. Push nozzle of Accutire on to tire valve. 

Make sure a good seal is made between the 

nozzle and valve stem so that no hissing 

sound of escaping air is heard.

3. Hold gauge on valve stem until the reading 

locks on the dispaly.

4. Promptly remove gauge from valve stem and 

read pressure. You may continue to use the 

gauge even though the previous reading is 

still displayed by following the instructions 

above.

    Note: The gauge will shut off automatically.

5. Check your tire gauge once a week, 

estimate the battery life is 1 year based on 5 

operations per day.

Zero Set

The gauge is a precision electronic instrument 

and from time to time it is advisable to check 

the zero setting especially at extreme hot or 

cold temperatures. To check the zero setting: 

Briefly press the gauge onto the tire valve. It is 

not necessary for a good seal to be made. Only 

a small amount of air must enter the gauge to 

zero set the unit. Promptly remove gauge from 

valve stem when display shows "00.0". Your 

Accutire has now been recalibrated.

Replacing the Batteries

To replace the batteries, unscrew the battery 

cover and remove the old batteries. Insert new 

batteries (Maxell LR44 or equivalent), being 

careful to observe the correct polarity. Replace 

the battery compartment cover and screw 

tightly.

Battery notes

1. Batteries included.

2. Do not mix old and new batteries.

3. Do not mix Alkaline, standard (carbon-zinc) 

or rechargeable (Nickel cadmium) batteries.

4. Do not dispose of batteries in fire. Batteries 

may explode or leak.

What to do if

1. You do not get any reading at all (either 

blank display or all zeros). Please reinstall 

the batteries and see the instructions and 

follow them carefully. If gauge still does not 

work, see Warranty and Service section.

 

  

2. You observe "Lo" on the display. The power 

supply has been depleted. Pls replace 

batteries

3. You observe an unusally high or low 

reading. Make sure no sound of escaping air 

is heard, as in Step 1 of the instructions. 

Also, make sure you are checking the 

pressure on cool tires which have not been 

driven on for several hours.

Tire pressure advice and actions

•  Always be sure to follow vehicle 

manufacturers recommended tire pressure 

ratings which are based on cool tire 

temperatures.

•  The electronic module and power cell are 

factory sealed in the unit. There are no user 

serviceable parts.

•  To clean the gauge, use a soft damp cloth. 

Do not immerse in, or spray with water or 

other liquid cleaner.

Warning

This product contains lead, a chemical known 

to the State of California to cause birth defects 

and other reproductive harm.

Warranty and Service

Measurement Ltd., Inc warrants this gauge 

against defects in material or workmanship for 

a period of five (5) years from the date of 

purchase and agrees to replace it free of 

charge. This warranty does not cover damage 

resulting from misuse or abuse of the product. 

Should your gauge require service, you may 

send it back to Measurement Ltd., Inc for 

repair or replacement.

Our authorized service center 

address is: 

Measurement Ltd., Inc.

11751 Rock Landing Drive, Suite H-7, Newport 

News, VA 23606

Attn: Customer Service 

Tel : 757-706-3839

US Patent No.D409931

  

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