Some say this scope is "noisy". Is it useful for measurements where the range is +/- 20 mV?

its noisy in the fact the fans arent quite. Not because of line noise... 20mv is not a problem

Does this item include the optional items(16ch logic decoder, usb awg and usb wifi)?

For WiFi you can use an Access Point that can be operated in "Client Mode". I am using a TP-Link N300 (WR802N) and it works very well. The other options really seem to require special firmware/license upgrades.

Is siglent sds1104x-e good for a beginner?

The SDS 1104X-E is a great scope. It is considered an entry level instrument. It is excellent for the individual entering the electronics field.

Can I decode ic, spi, uart/Rs232, can, lin signals with the the scope, i.e. without the sla1016 module?

Yes! Decoding is included with the base model! There is no need to purchase a software license (or "hack" the scope) to unlock the decoding options.

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Description

⚡ Unlock the power of precision — see signals like never before!

DECODE LIKE A PRO - Built-in serial bus decoders for I2C, SPI, UART, CAN, and LIN keep you ahead in embedded system debugging.
MULTITASKING MASTER - 4 simultaneous channels plus optional 16 digital channels let you decode complex signals effortlessly.
NEXT LEVEL VISUALIZATION - 256-level intensity grading and 400,000 frames/sec capture rate deliver unmatched waveform clarity.
FUTURE READY CONNECTIVITY - Optional USB WiFi adapter and AWG module enable remote control and advanced signal generation.
PRECISION AT YOUR FINGERTIPS - Experience ultra-clear signal fidelity with 100MHz bandwidth and 1GSa/s sampling rate for flawless waveform capture.

The Siglent SDS1104X-E is a professional-grade 100MHz digital oscilloscope featuring 4 input channels and a blazing 1GSa/s sampling rate. It boasts advanced SPO technology for superior signal fidelity, multiple serial bus decoders, and a high-speed waveform capture rate of 400,000 frames per second. With optional digital channels, USB WiFi, and AWG modules, it’s designed for engineers who demand precision, versatility, and future-proof connectivity in one sleek, gray package.

Specifications

Manufacturer	SIGLENT
Part number	SDS1104X-E
Item Weight	2.99 Kilograms
Product Dimensions	31 x 13 x 15 cm; 2.99 kg
Is Discontinued By Manufacturer	No
Size	1-(Pack)
Color	グレー
Style	100MHz
Pattern	4ch
Item Shape	Rectangle
Item Thickness	26 Centimeters
Power source type	We
Measurement System	Metric
Measurement Accuracy	≤±3.0%: 5 mV/div-10 V/div ;≤±4.0%: ≤2 mV/div
Display Style	TFT - LCD
Specification met	FCC
Specific Uses For Product	Professional
Included Components	USB Cable -1, Quick Start -1, Passive Probe -4, Certified -1, Power Cord -1
Batteries Included	No
Batteries Required?	No
Item Dimensions LxWxH	31 x 13 x 15 cm

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