ER-GB37-K44B Wet/Dry Precision Cutting Rechargeable Trimmer with Quick Adjust Dial
- 20 length settings 1 mm to 10 mm, 0.5 mm without comb
- Serrated stainless steel blades, wet and dry use
- Lithium-ion, up to 50 minutes cordless, about 8 hours charge
Longest comb length separates hair trimmers more than any other detail: 10 mm on the Panasonic ER-GB37, 18 mm on the ER307 and 12 mm on the Havells GS7608. A buyer who wants hair longer than that needs a clipper, not a trimmer.
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Maximum comb length separates the four hair trimmers compared here more than any other detail. The longest stated setting runs from 10 mm on one Panasonic model to 18 mm on another, and the Havells kits sit between them.
This guide is for a man who wants to cut his own short scalp hair at home, and not his beard. A trimmer that cannot reach the length he has in mind will not do the job, so the length comes before every other feature.
Before looking at any model, a buyer can settle how long the hair on top should stay after a cut. Hair left longer on top calls for a tool with longer combs, and the highest setting on a trimmer is its limit. The settings are chosen by dial or by changing combs, depending on the model.
Lengths of 20 mm and above call for a clipper, which none of the four models here reaches. Philips India lists clippers that go well past that, and the HC5450/15 page lists 24 length settings up to 23 mm.
The Philips HC3420/15 lists 13 settings in a range of 1 to 23 mm, and the QC5132/15 family clipper lists 11 settings from 3 to 21 mm. All the Philips clippers found on its India pages are marked Discontinued, so none is recommended here.
Panasonic gives the ER-GB37 a Quick Adjust Dial with 20 length settings, running from 1 mm to 10 mm. It can also cut at 0.5 mm without a comb, using serrated stainless steel blades.
The ER307 from the same brand has 12 settings from 2 mm to 18 mm, the longest reach among the four. It too trims at 0.5 mm without a comb.
For the GS7608 kit, Havells lists two hair combs, at 9 mm and 12 mm. The GS4008 kit also has two hair combs, but its page does not say what lengths they are.
A third Havells kit, the GS6668, is listed with two hair combs and no lengths. The GS8714 listing shows no hair attachment.
Among the models with stated lengths, only the ER307 reaches 15 mm on top. Hair kept very short is within range of every Panasonic and Havells model that states its combs.
Panasonic presents the ER-GB37 and the ER307 as trimmers, so hair cutting is their main job. Havells sells the GS7608 and the GS4008 as 8 in 1 kits, and the 2 in 1 blade in each covers beard as well as hair.
A kit adds beard combs and other attachments, while a dedicated trimmer keeps the list shorter. The GS4008 page counts four beard combs against two for hair, which shows how the kit is split between jobs.
A haircut takes longer than a beard trim, so run time and the option to plug in matter more here. The ER307 runs corded or cordless, with up to 40 minutes of cordless use, and the GS7608 also runs corded or cordless with 90 minutes of run time.
Cordless use alone is listed for the ER-GB37, which has a lithium ion cell, up to 50 minutes of use and a charge time of about 8 hours. The GS4008 shows 90 minutes of run time and a 90 minute charge, and its page does not state corded use.
Wet use is stated for only one model. Panasonic says the ER-GB37 is for wet and dry use, while the ER307 page says dry operation only. Havells does not state wet or dry use for either kit.
| Model | Longest hair setting | Power | Wet or dry |
|---|---|---|---|
| Panasonic ER-GB37 | 10 mm (20 settings) | Cordless, up to 50 minutes | Wet and dry |
| Panasonic ER307 | 18 mm (12 settings) | Corded or cordless, up to 40 minutes | Dry only |
| Havells GS7608 | 12 mm hair comb | Corded or cordless, 90 minutes | Not stated |
| Havells GS4008 | Not stated | 90 minutes run time | Not stated |
The ER-GB37-K44B is a wet and dry precision cutting rechargeable trimmer. It suits a man who wants very short, even home cuts and is happy to stay at or below its longest setting.
Its limits are that longest setting and a store page with conflicting returns wording. One passage says items damaged on arrival are replaced, but the same page’s disclaimer says refunds and replacements are not accepted. The page gives no detailed care steps.
Corded and cordless use comes with the ER307WS24B, which has the same Quick Adjust Dial design. Panasonic gives a two year warranty in the FAQ and mentions a cleaning brush and blade oil.
It suits a man who wants a longer maximum length than the ER-GB37 and the option to plug in during a long cut. The page gives the blade type as not specified, and its charge time and its list of box contents are stated inconsistently.
Described as an 8 in 1 grooming kit, the GS7608 has a 2 in 1 blade for beard and hair. It carries a lithium ion battery, charges over a Type C port in 90 minutes, and shows a digital battery display, with a guarantee of two years.
It suits a man who wants hair, beard and body grooming in one kit and does not need hair longer than 12 mm. Wet or dry use is not stated for the kit, and no IP rating appears.
The GS4008 is also an 8 in 1 kit with a 2 in 1 blade, two hair combs and four beard combs. Its box holds a cleaning brush and an oil bottle, and Havells gives it a guarantee of two years.
It suits a man who wants an all in one kit that includes hair combs. The page does not state the hair comb lengths, corded use, wet or dry use or an IP rating.
Both Havells models are sold as kits, so they are bought for several jobs and not for hair alone.
The Philips India hair clipper range lists four models, the HC3420/15, HC3505/15, QC5132/15 and HC5450/15. The product pages for the HC5450, HC3420 and QC5132 each show Discontinued, and the listing page marks the HC3505 the same way.
Panasonic India lists five items in its male trimmer category, which are the ER-GB37-K44B, the ER307WS24B, the ER-GY10-K44B, an ER417K44B nose and hair trimmer and an ES-SA40 shaver. The category page gives no run times.
Charge time on the ER307 page is stated inconsistently, so no figure is given here for that model.
Items for blade upkeep appear on the Panasonic pages and on the GS4008 page. Panasonic names a cleaning brush and blade protecting oil, and the GS4008 box includes a cleaning brush and an oil bottle.
Philips India describes its hair clippers as suited to cutting your own hair or a friend’s, and this guide gives no cutting technique. No barber or hair care source is cited.
The comparison covers Panasonic and Havells only, with two models from each brand. Beardo markets a professional vacuum trimmer, but its page describes beard trimming and lists no length settings or run time, so it is not compared.
Home use is within what the pages describe, since the ER-GB37 and the ER307 list length settings for hair cutting, and the Havells kits list hair combs. This article gives no cutting method, so a barber or a hair care guide is the place for that.
Not among the four models compared here. Lengths of 20 mm and above call for a clipper, and the Philips clippers found with longer settings are marked Discontinued.
Corded use is stated for the Panasonic ER307 and the Havells GS7608. The Panasonic ER-GB37 is listed as cordless.
Wet and dry use is stated for the ER-GB37 only, and the ER307 page says dry operation only. Havells does not state either way for the two kits.
A cleaning brush and blade protecting oil are mentioned on the Panasonic pages. The Havells GS4008 lists a cleaning brush and an oil bottle in the box.