Mini oscilloscope buying guide

Updated: 22 October 2026

You are looking at pocket scopes on amazon.co.uk. Prices sit close together, from £34.98 to £79.99, while the bandwidths do not. A mini oscilloscope buying guide has to split that band before the star lines do. The FNIRSI DSO152 is 200 kHz. The DSO153 is 1 MHz. Two BSIDE OT3 listings are 10 MHz. The OT5 listings and the only two-channel unit are 50 MHz. Prices and the seven rows are on the mini oscilloscope comparison. Peter F. checked those amazon.co.uk listings. This is not a lab test. A qualifying purchase through our amazon.co.uk links can earn a commission at no extra cost to you.

Our top picks

Badge	Product	Bandwidth	Channels	Voltage claim	Note	Price	Offer
Best overall	BSIDE BSIDE two-channel 50 MHz	50 MHz, 250 MS/s	2 stated, one BNC probe in the box	Not stated, no CAT rating	8.0	about £79.99	View offer
Best value	BSIDE BSIDE OT3 (probe and clips)	10 MHz, 48 MS/s	Not printed; a review calls it one channel	±400 V, no CAT rating	7.4	about £39.99	View offer
Alternative	FNIRSI FNIRSI DSO152	200 kHz, 2.5 MS/s	Not printed	800 V peak-to-peak and 400 V, no CAT rating	4.8	about £38.57	View offer

Best overall

BSIDE BSIDE two-channel 50 MHz

8.0/10about £79.99

View offer

Best value

BSIDE BSIDE OT3 (probe and clips)

7.4/10about £39.99

View offer

Alternative

FNIRSI FNIRSI DSO152

4.8/10about £38.57

View offer

On this page

1.Start with the signal, not the pounds
2.Sample rate only counts with memory and with the channels switched on
3.The probe and the ground clip are part of the specification
4.What that leaves you holding

Start with the signal, not the pounds

Bandwidth is the frequency at which the displayed amplitude has already fallen by about 3 dB. A working rule of thumb is about three times the fastest sine you care about, or about five times a digital clock if the edge is the point. Audio clipping can live inside 200 kHz. A hobby clock or a repetitive vehicle sensor wants 10 MHz before you trust the shape. Faster edges want 50 MHz.

Sample rate only counts with memory and with the channels switched on

The Institution of Electronics says you must sample at more than twice the bandwidth or the trace can alias. Rohde & Schwarz uses 2.5 times bandwidth as a buyer minimum, and warns that the rate can fall when a second channel is on. The OT3 states 48 MSa/s against 10 MHz. The two-channel listing states 250 MSa/s against 50 MHz. The BSIDE models quote 128 Kb, without saying bytes or samples, so this page will not turn it into a millisecond. Deep memory is a bench purchase, on the mini oscilloscope vs bench page. Only B0DHCNZCF4 states two channels, and the box lists one BNC probe.

Testsieger

BSIDE BSIDE two-channel 50 MHz

8.0/10about £79.99

View offer

The probe and the ground clip are part of the specification

A 10x probe is a divider. The switch on the probe and the factor in the menu have to match. A 10x probe with the channel left on 1x throws the trace off scale. That first hour is on the how to use a mini oscilloscope page. UK mains are 230 V RMS, about 325 V peak. HSE GS38 expects electrician's probes to meet BS EN 61010-031, show a CAT mark, and limit the exposed tip to 4 mm or less. None of these seven listings state a CAT rating. Two clips on two different potentials can short the circuit. Work on electrical equipment needs competence under the Electricity at Work Regulations 1989, or supervision.

What that leaves you holding

Four classes survive once bandwidth leads. The slow class is 200 kHz or 1 MHz. The 10 MHz class is two OT3 listings at £39.99. B0DQKZ8BLF shows 4.6 from 31 reviews. B0DQPP2FKZ shows 4.0 from 76, and a UK review timed about 15 minutes. The 50 MHz class is two OT5 listings at £59.99. The two-channel class is one listing at £79.99, with one probe. Who each is for is the best handheld oscilloscope page. Leave the band for isolated inputs, a CAT rating, or a protocol decoder.

Common questions

How much bandwidth do I need before I look at price?

Decide the fastest sine, or the clock edge, before you sort by pounds. About three times a sine, or about five times a clock if the edge matters, is the rule of thumb used here. Audio clipping can sit inside the DSO152's 200 kHz. A hobby clock or a repetitive sensor waveform wants the 10 MHz OT3 before you trust the shape. Faster edges want 50 MHz, which is the OT5 or the two-channel listing. Price does not choose bandwidth for you.

Why is 2.5 MS/s not a 10 MHz scope?

Sample rate and bandwidth are different limits. The DSO152 states 2.5 MS/s and 200 kHz. That rate is more than enough for 200 kHz, and the bandwidth is still 200 kHz. A 10 MHz scope in this set is an OT3, which states 48 MSa/s. Buying the larger MS/s number on the slow unit does not move the -3 dB point. If the title and the bandwidth bullet disagree in your head, trust the bandwidth bullet.

Do I need two channels?

You need two channels when two waveforms must share one timebase, such as crank against cam. One channel is enough for a single repetitive voltage. Only B0DHCNZCF4 states two channels, and the box lists one probe. A second probe is something you add.

Is ±400 V safe on a UK socket?

No. None of these listings state a CAT rating, and ±400 V is not a category. UK mains are 230 V RMS, about 325 V peak. HSE GS38 looks for a CAT mark, a finger guard, and an exposed tip of 4 mm or less on electrician's probes. A seller sheet that mentions ±40 V on x1 and ±400 V on x10 is still not permission to probe a consumer unit. If the job is a socket, a board, or a live appliance, this shelf is the wrong tool.

Why do two OT3 listings at the same price differ?

Both are £39.99 and both state 10 MHz and 48 MSa/s. B0DQKZ8BLF shows 4.6 from 31 reviews, lists a probe and an alligator lead, and claims 1,200 mAh and more than eight hours. B0DQPP2FKZ shows 4.0 from 76, and a UK review timed about 15 minutes. Its cell bullet and its technical table disagree about whether a battery is included. Treat them as two products. An eight-hour sentence on one ASIN is not a measurement of the other.

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