The need to carry out small household chores arises quite often, and manual electric tools, which are always at hand, facilitate this process. One of these tools, replacing a mountain of unnecessary screwdrivers, is a screwdriver. He is able to help quickly and without effort to carry out internal work, and our review and quality criteria of such an "assistant" will facilitate the right choice when buying it.
Criteria and parameters for choosing a screwdriver
Screwdriver - hand-held power tools designed for installation and fastening works, in their functions resembling a drill. To appreciate the wide range of products is difficult, because Many factors affect the choice of the buyer.
For some, the technical characteristics of the product are important, someone relies on reviews of a well-known brand, but practically everyone is interested in additional characteristics and the availability of a service guarantee. In order not to purchase "a cat in a bag" it is important to know what to pay special attention to when buying.
Did you know? In addition to its intended purpose, the screwdriver can be used for other household needs: for example, as a cleaning device for hard-to-reach and highly polluted places. To do this, tightly fasten any nozzle in the coupling.
Brand and reviews
Major manufacturers of household appliances and power tools carefully consider their reputation, and therefore, bringing the product to the consumer, they adhere to the quality standards of their products.
Honest reviews about well-known brands have formed a positive opinion about the screwdrivers of such brands:
- "AEG" - The trademark of the Chinese manufacturer of power tools Tecnotronic Industries. The high quality of the goods influenced the price level of the products, but with the time of operation, all invested funds are fully justified.
We recommend that you read about why the chainsaw does not start, how to install and sharpen the chain for chainsaws, and also how to choose the right machine for sharpening.
- "DeWALT" - American manufacturer of industrial power tools, high quality and durable products. The price is relatively high, but justified in price / quality ratio.
- "Bosch" - German manufacturer of household and building technical products, is most in demand in sales. It is presented by a wide model range, differs in high quality and wear resistance of all tools. The optimal price maintains fame and "buyability" at the proper level.
Important! Before buying a screwdriver, you should ask the seller about the availability of spare parts and accessories for the tool and their availability.
- "Makita" - Japanese manufacturer of power tools. The company also produces a wide range of models and has an average price category. Along with "Bosch" is the leader of the rating.
Did you know? The screwdriver, though not with a very powerful battery, will perform more work for the same unit of time than a drill powered by 230V mains.
- "Intertool" - a domestic manufacturer of construction power tools with a wide range of goods. The low price and quality of products form a high demand for it.
- "Hyundai" - Korean manufacturer of innovative building, electrical and automotive technologies. It produces a wide range of products in different price categories. Durability, comfort and quality of products are already appreciated by many consumers.
It will also be useful for you to familiarize yourself with the main criteria for choosing an electric lawn mower, as well as electric and gasoline trimmers for the site.
- "Fiolent professional" - a domestic manufacturer of professional power tools. It is famous for high quality and low price for products.
Battery or network: ergonomics
The choice of tool affects its convenience. Sophisticated ergonomic design should provide a comfortable position in the hand. This feature is influenced by special rubber inserts on the tool. Proper balancing is also important. helps him maintain a horizontal position when working.
An important characteristic is the type of power tool - battery or network. The power supply type of the screwdriver limits the area of its use by the cord length and is directly dependent on the presence and location of sockets in the house.
Such a tool has a more affordable price, but in sales is not as often as a battery. A cordless screwdriver is convenient and mobile to use, but its quality affects the higher price of tools. 
Also, do not forget that a timely purchased spare (replaceable) battery allows you to perform internal work without interruption to recharge the tool.
Battery Type and Capacity
Having decided on the type of power supply and having stopped your choice on a cordless screwdriver, you need to understand that the type of battery (batteries) and its capacity directly affect the power of the tool. Characteristics such as charging speed and the duration of the work to be performed also depend on the type of battery.
NiCd batteries (Ni-Cd)
The standard for cordless screwdrivers are nickel-cadmium batteries. Despite the fact that this type contains highly toxic heavy metals - it still remains the most common option for nutrition.
Important! When the charge is not fully discharged nickel-cadmium battery decreases its capacity and future performance time.
The advantages of a Ni-Cd battery include:
- acceptable cost;
- safety of capacity at the correct use;
- long term work (more than 1000 charge / discharge);
- high current.
- poor performance at low temperatures;
- loss of charge capacity during long-term storage;
- restoration of capacity after storage only after 6 cycles;
- the need to fully discharge the battery;
- difficulty recycling.
NiMH batteries (Ni-MH)
Unlike the Ni-Cd type, nickel-metal hydride batteries are environmentally friendly to use. They do not contain heavy metals, and therefore do not require compliance with the conditions for their disposal. But, despite all the positive qualities, they still have some drawbacks. 
The advantages of the battery type Ni-MH include:
- availability of use at low temperatures;
- large charge capacity;
- low loss of capacity during storage;
- environmental friendliness.
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Cons Ni-MH:
- relatively high price;
- impressive weight;
- high loss of charge during long-term storage;
- capacity reduction after 300 charge / discharge cycles;
- limited service life.
Important! You need to charge Ni-Cd and Ni-MH batteries only after they are completely discharged.
Keep this type of battery should be in a dry and cool place. At high storage temperatures, its capacity decreases.
Lithium-ion batteries (Li-Ion)
The corrected deficiencies of the types Ni-Cd and Ni-MH are concentrated in Li-Ion type batteries. Lithium-ion batteries are significantly different from their predecessors and have such advantages in use:
- do not require full discharge / discharge, charge is permissible as needed;
- no loss of charge during long-term storage;
- fast charge;
- large capacity;
- low weight
By cons of the type of Li-Ion include:
- high cost;
- short life at low temperatures;
- limited service life.
Capacity
Battery capacity - indicator of time of consumption and return of energy during operation. The higher the battery capacity, the higher the power of the screwdriver, and accordingly, the performance and operation time.
From the accumulated energy of the battery depends on the power of torque and the ability to perform additional functions with a screwdriver. The total power is measured in volt-amperes (V · A). On sale you can find models of screwdrivers with a battery capacity of 9.6; 12; 14.4; 18 and 20 V.
Important! In Li-Ion type batteries, the service life is directly proportional to the charge / discharge cycles, which means: the more often the battery charges and bursts, the less its life.
Indicators 18 and 20 are more suitable for professional tools. Indicators 9.6 and 12 are too low and are not suitable even for regular household use. Favorable indicator for home use - 14.4 V. This "golden mean" is optimal in its power and time of operation. 
Torque value
Battery power affects the strength and number of revolutions when the screwdriver is operating, and these characteristics are embedded in the amount of torque. If in simple terms, the magnitude of the torque indicates how fast and with what force screwing is available.
The number of revolutions indicates what function the instrument is capable of performing:
- a small number of revolutions is intended for screwing in (800 rpm);
- a large number of revolutions is intended for drilling (1500-2000 rpm).
The magnitude of the torque also determines the possibility of screwing up extra long screws, self-tapping screws, and screws, which require a large screwing force to work with. The magnitude of the force is measured in Newton meters (N · m) and is optimal for domestic use in the range of 10-30 N · m. For professional tools, this value can reach from 100 to 600 N · m.
Additional functions
Manufacturers of construction tools, to facilitate the work and expand the scope, equip them with additional functions. For screwdrivers, as such, the presence of a pulsed mode, forced braking and impact function is provided.
In addition, the tool is additionally equipped with LED lighting, reverse for unscrewing, automatic feeding of self-tapping screws, as well as a battery charge indicator.
Pulse mode
Equipped with a pulsed mode helps to screw the screw into even and smooth hard surfaces. This means that the screwing is intermittent, i.e. frequent uniform shocks. 
Forced braking
Equipping with forced braking allows you to stop the tool without turning it over, i.e. timely and accurate braking after releasing the button. This function is especially important when it is necessary to tighten the screws "not completely."
Hit
Equipping the shock mode helps to work with particularly durable surfaces. Revolutions occur intermittently, as in pulsed mode. When working with the tool, the shock mode is connected only with an increase in resistance, which means that at low loads the screwdriver works with continuous turns and in the non-impact mode.
Important! With the impact function, the drilling speed is reduced.
When choosing, it is better to give preference to the screwdriver with switching modes "shock / unstressed", which will help to preserve the battery charge. The optimal index of impact function for domestic use is up to 3200 beats per minute.
Contents of delivery
The scope of supply of the tool usually includes:
- briefcase (case);
- screwdriver;
- battery (1 or 2);
- battery charger;
- belt mount for the tool (not always);
- bit holder with nozzles for screws;
- instruction;
- warranty card service.
Type of cartridge
Types of cartridges for fixing attachments are of 2 types:
- Keyless - have 3 faces and allow you to quickly replace the nozzles (the thickness of such nozzles can be any). According to its structure, this type of cartridge can be single or dual-coupling, which means the possibility of fixing the cartridge for a single-attachment or fastening the cartridge and the clamping shaft for a two-coupling tool.
Important! At operation of the screwdriver use only "native" for this model of nozzles is recommended.
- Key - assume the presence of a special key for changing and securing nozzles.
Because of the ease of use, most often, their choice is stopped at a screwdriver with a keyless chuck type, but it is worth considering the fact that the cost of such a tool is much higher than a tool with a key type.
Repair service and warranty
Typically, manufacturing companies provide after-sales service for power tools. The screwdriver has a relatively long service life, but when buying it is still important to ask about the availability of the warranty and its validity period. The average warranty period is 1-2 years.
To attract buyers, the firm-seller can also provide additional warranty service of the tool, which you can also ask the seller for when purchasing. Screwdriver - an indispensable tool for small and large repairs to the house.
The choice of the model is influenced by many factors, having previously read them, you definitely cannot go wrong with the purchase. 
Equipping it with additional features will help facilitate future repairs, and having a complete set and warranty service will help avoid unnecessary expenses in the future.
