The detector is switched on by pressing the "off" button located on the right side of the control panel. I have not tested rechargeable batteries, but normally they last about 50 - 60% of the time of good alkaline monocells. When I tested the detector, my favorite and proven alkaline monocells lasted more than the advertised 25 hours, even though the outside temperature was less than 10 degrees. The manufacturer recommends using alkaline batteries or good quality rechargeable batteries as a rule. You really need to take care when installing or replacing the batteries, because if you want the detector to be waterproof, the door must be closed correctly and accurately. After inserting the new monocells (be careful not to swap the contacts - you won't break the unit, but it has protection, but it won't work), slide the case back in (it can't be inserted properly anyway) and finally secure the door. Installing the monocells themselves is fairly simple by sliding the door on the back of the control panel open, the battery case can be pulled out and the batteries removed using the folding handle. If you use good quality alkaline monocells, such endurance is really not a problem. The F22 detector, like its bigger brother, runs on 2 - 1,5V AA batteries that last 25 hours + of normal operation. I decided to try and test the new metal detector Fisher F22 at the Slap reservoir, because it is drained a few meters every winter, which makes it a little more difficult for us toour cottage every time, the fields flooded by the dam and even the old road leading under the river to the former ferry from Zvírotice to Županovice are exposed. With the VCO tone we get infinitely more information than we get from a detector that offers only normal digital tones. According to this VCO variable and not just flat digital tone we will be able to estimate much more confidently the size, shape and composition of a localized object in the ground, as well as its distance from the probe. The tones can be set in CUSTOM so that the irons grumble monotonously and the coloured targets whistle upwards instead. This is because things can be estimated not only by the digital display, where the numbers correspond to the likely electromagnetic conductivity of the object (along with its shape, size and distance from the probe, of course), but also just by the sort of analogue audio output. It is this tone mode that most "professionals" use on their F75 LTD, F75 and F70 (the F19 LTD and Goldbug DP Pro also have VCO tone) to set the signaling of non-ferrous metals. We can also combine and select from 4 tones or choose a variable VCO tone. Other useful features also include 3 preset search programs + an optional Custom mode, where custom tone settings can be selected and stored in memory for individual conductivity categories, if you want metal types. This useful feature, which has so far only been fitted to the top models Fisher F75 Ltd V2.0, Fisher F75 V2.0 and Fisher F19 Ltd, allows the tonal responses of the iron to be muted, while the volume of the coloured targets remains unchanged. What is not missing, however, is the very popular FeTone™ function, which is sure to be welcomed and appreciated by most searchers. The final difference is the size of the triangular probe, which is slightly smaller than the F44 (29x17cm) and measures 25x14cm. Compared to it, it lacks several features such as manual ground tuning, a separate All-Metal mode and a backlit display like the F44. TheFisher F22 is therefore the middle model of this new range of metal detectors and is very similar in technology and user experience to the most powerful and feature-rich Fisher F44 model. The new Fisher F44 model (which we tested recently) replaces the F4 detector, Fisher F22 then the older F2 model and, as a complete novelty, the new Fisher F11 metal detector, which is the most affordable detector of this legendary and time-tested brand. These include volume control, numeric ID display, selectable sound modes with 4 tones + variable VCO sound mode, preset programs plus optional CUSTOM program, FeTone™, setting memory, and as icing on the cake, water resistance. A pleasant finding was that these new metal detectors have features that are otherwise only offered by detectors in a much higher price range. The world's first and oldest metal detector manufacturer, the American company FISHER Labs, introduced 3 new "F" series metal detectors in the middle of last year.
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