Review of desktop scales Redmond RS-758: work without batteries

It would seem that you can write about kitchen scales? Everything has long been weighed and measured, forgive us for the pun. But then we opened a new box and were extremely surprised.

Okay, God bless him that Redmond RS-758 work without batteries. How they do it is another question, and we will answer it in the process of studying. But the appearance of the scales turned out to be so amazing that for some time we could not find words to describe it.

But we got together, focused, admired – so its outstanding appearance did not prevent us from testing the device in the usual way. And now we will tell you everything in detail.


Manufacturer Redmond
Model RS-758
Type table scales
Country of Origin China
Warranty 1 year
Service life * 3 years
Material plastic, stainless steel
Measuring range 5 g – 5 kg
Measurement interval 1 g
Source of power power generation system
Tare function there is
Number of sensors 4
Display liquid crystal
Overload indication there is
Low battery indication there is
Selecting units of measurement grams, ounces, milliliters
The weight 180 g
Dimensions (W×H×D) 220×66×24mm
Retail offers

* Contrary to common misconception, this is not the period after which the device will definitely break. However, after this period, the manufacturer ceases to bear any responsibility for its performance and has the right to refuse to repair it, even for a fee.


The packaging of the scales is designed in the Redmond corporate style: full-color printing on a black background and a photograph of the device on the front side. To the usual image of a working device, the manufacturer added a photo of the scales in the charging position: the main feature of the RS-758 is operation without batteries.

Other features of the device worthy of mention on the box include the presence of four highly sensitive sensors that provide measurements from 5 to 5000 grams in 1 g increments, and a choice of units of measurement (grams, ounces or milliliters).

Inside the box, in addition to the scales themselves, we found an instruction manual and some promotional materials.

At first sight

The RS-758 housing consists of two parts: movable and fixed. It is made of black plastic and the top panel is made of brushed stainless steel. Agree, the view is as different as possible from the usual form factor of kitchen scales

The round part of the body hides the energy generation mechanism – the main “highlight” of the model. When the balance is unfolded, a gearbox is activated that rotates a miniature dynamo, and the generated current charges a supercapacitor, the charge of which is consumed during weighing.

The body of the instrument extends approximately 30°. In this form, the scales are convenient to use with large items, and small containers can be weighed on the folded device.

The weight is visible on the LCD display, which automatically turns on when the capacitor is sufficiently charged. The screen is equipped with a charge indicator, has good contrast and is perfectly readable from any angle. It also displays the selected system of units of measurement – grams, ounces or milliliters.

The display has no backlight.

The choice of units of measure is made by the “Unit” button on the underside of the balance. The device rests on four legs with anti-slip pads, inside of which weight sensors are hidden.


Designed in the corporate style of Redmond, the brochure is printed on thick glossy paper. Printing quality is good, rather small text is easy to read.

The document was drawn up in three languages – Russian, Ukrainian and Kazakh. The Russian-language part of the instruction takes 10 pages, the first two of which consist of a quick start guide, made in the form of a comic book. Having studied a few pictures, it is quite possible to skip the text part – they are quite enough to get started.

The instruction manual contains comprehensive information about the design of scales, their use in everyday life and technical characteristics, and the document ends with pages for marking the seller and the service center: the brochure also serves as a service book.


To tare this model, there is a touch button on the end of the device – with the corresponding designation.

The choice of units of measurement is carried out by the “Unit” button located on the bottom side. Grams, ounces, milliliters of water and milk are selected by successive clicks on it.


The scale turns on automatically when sufficient charge is reached. To do this, it is enough to move and push the sides of the device three or four times. No noticeable effort is required: only the sound of a rotating gearbox reminds of the operation of the power generation system.

After that, the device should be placed on a smooth hard surface in a folded or unfolded position and use the “Tare” button to reset the readings.

Scales have good accuracy with the correct location of the load: it is better to place the object to be weighed as close as possible to the geometric center of the panel. Load displacement can distort readings.

Three folding and unfolding is enough to power the scales for 2-2.5 minutes. It makes no sense to make more movements: this will not increase the duration of the work.

The scale will automatically turn off when the charge is exhausted.


The weighing platform is wiped with a damp soft, and then with a dry cloth. To clean the device, the manufacturer does not recommend using abrasive and alcohol-containing detergents, metal brushes and other hard objects.

Our measurements

To assess the accuracy of weighing, we used a reference set of weights and carried out a series of measurements in the range from 1 to 1000 g. The results were summarized in a table.

Reference weight, g Indications of scales, g Reference weight, g Indications of scales, g
one 0 100 100
2 0 200 200
3 0 300 299
4 0 400 401
5 0 500 500
7 5 600 601
ten eight 700 701
fifteen thirteen 800 801
20 20 1000 1000

The lower measurement limit for the Redmond RS-758 is slightly more than the declared five grams: the readings become accurate with an increase in weight up to 20 g. And from four hundred, the device begins to overestimate the readings slightly, by one or two grams.

For a kitchen appliance, this is almost perfect accuracy.


Desktop scales Redmond RS-758 have an amazing and cute appearance, comfortable design and excellent accuracy. But their main attraction is in the energy generation system, which allows you to do without additional power sources. The device does not require regular purchase of new batteries, allows you not to worry about the disposal of old cells and is always ready for use. One “charging” of the device is enough for most household tasks.

The convenient fold-out design makes it easy to weigh items of different sizes, and the easy-to-read display is legible from any angle. The only drawback of the screen may seem to be the absence of a backlight, sacrificed for the efficiency of the device and the duration of work from a single charge cycle.

Pros :

  • do not require additional power supplies
  • excellent measurement accuracy
  • comfortable design
  • stylish and unusual look

Cons :

  • lack of display backlight

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