Shelf life: The shelf life of the powder is 2 years.
Usesage:
For PH-acid test pen calibration, 250ML standard solution can be prepared per pack
Instructions:
1 . Prepare two empty cups larger than 25oML, use beakers or graduated bottles, or use disposable cups
2 . Pour the two specifications of the calibration liquid powder into each, and then label the surface of the cup to indicate the specification of the poured powder for easy identification.
3 . Pour 25OML distilled water into two cups
4 . Gently stir with a glass rod until the powder dissolves. No glass rods can be used with clean chopsticks.
5 . The above steps are completed and the calibration can be started.

Features:
- High hardness and good toughness and resistance.
- Ideal for computer,watch,eyeglass,telephone Laptop or other electronic products.
- With a well-organized box, you can store your screwdriver set in your pocket or backpack.
- Non-slip handle,it have been ergonomically designed to make things comfortable for Increase the torque.
Specifications:
Material: Chromium Vanadium Alloy Steel
Package included:
30 x Screwdriver bits
1 x Extension bar
1 x Screwdriver handle
1 x Storage box
Notes:
1. Manual measuring, please allow 1 ~ 3mm error,thank you.
2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the picture.

Mini Magnetizer Demagnetizer Magnetic Pick Up Tool for Screwdriver Tips Screw Bits
Description:
Magnetize your screwdrivers to allow them to grab small screws
Demagnetize your screwdrivers to safely work on sensitive electronics
Alternate magnetizations as many times as you want
Size: 40 x 30 x 20 mm (Mini size,please check carefully before you buy.)
Net weight: 20 g 
What's in the Package:
1 x Magnetizer & Demagnetizer
Screwdriver NOT included.

20 in 1 Mobile Phone Repair Tools Kit Spudger Pry Opening Tool Screwdriver Set for iPhone FOR iPad FOR Samsung
Description:
Professional screwdriver & prying tool kit
Easy to use and handle
Screwdrivers with anti-slip handle and magnetic tips
Made of high quality material, durable and high precision
Professional repair tools aim to giving assistance during devices repairing
Ideal for the preservation and maintenance of the precise work and the optics facilities, such as precise watches, mobile phones, televisions, smart phone, PDA, PC & other applications
Tools in different sizes for all needs
In Retail package,Great for resale or for you store
Please note:The color of accessories maybe changed,please make sure you do not care.
Specification:
Condition:Brand New
Gross Weight: 105 g
Packing:Simple OPP bag
Number:20 pcs
Material:Steel,Plastic
Application:Mobile phone,tablets,PC repair
What's in the Package:
5 x Plastic guitar picks
2 x Mini suction cup
1 x Metal opener
1 x Flexible scraper
1 x Straight tweezers
2 x Plastic spudger
1 x 0.8 x 30mm Pentalobe screwdriver
1 x 1.5 x 30mm Phillips screwdriver
1 x 1.5 x 30mm Flat head screwdriver
5 x Plastic prying bar

High Quality,correct handle shank diameter, 2.35mm can be fited most of machines
Packing Content: 12 Pcs Quartz Grinding Heads
Notes:
(1) Check nail bits before use
(2) Always wear eye-protective safty glasses
(3) for Professional use only
(4) Do not use if it dropped
(5) Keep out of rach of Children
(6) Disinfect nail bits after use