Testing is more professional. C weighted simulation of high strength human ear noise frequency characteristics, suitable for machine motor, machine sound pressure analysis. 1 x Noise Decibel Detector.
eBay
52MM Water Level+Sewage Level Meter Digital Dual Gauge Water Or Sewage Level Sensor 0-190ohm HTG for Boat Car 12V 24V Customized
Aliexpress UK
Concentration Unit Decibel: dB. Humidity Range: 20%-85%. Relative Humidity: 20%-85%. Display: LED Display. Size: Approx. 10.6 x 3.5 x 1.4in/26.92 x 8.89 x 3.56cm. 2 x Expansion Tube. Temperature Range: 14℉-140℉.
eBay
Water Level Transmitter 0-0.5M-500M Liquid Water Level Sensor 4-20mA 0-5V 10V RS485 Output Pool Tank Hydrostatic Level Meter
Aliexpress UK
Alarm Prompt: The default alarm value for power on is 130dB. Level Display Bar: With analog bar level indication, 6 bars noise decibel display, 30-75dB display is green, 76-130dB display is red, clear and intuitive.
eBay
Water Level Sensor+52mm Water Level Meter Tank Indicator With Red Backlight 0-190Ohm Water Level Gauge for Car Boat 9-32V Custom
Aliexpress UK
Mini Electronic Digital Angle Protractor. nn Robust Design and Magnetic Features nConstructed from high-quality aluminum alloy, this digital angle gauge is not only lightweight and portable but also sturdy and durable.
eBay
KKMOON Digital Fuel Level Gauge with Flashing Alarm Car Fuel Level Meter 9-35V Fuel Level Tester for Auto Motorcycle
Aliexpress UK
Type: Digital Angle Finder. 1 Magnetic Digital Angle Finder. TYPE-C CHARGING PORT AND CONSTRUCTION: Featuring a Type-C charging port for quick recharging, this gauge is made from materials for long-lasting performance, while being compact and lightweight for easy portability.
eBay
Water Level Sensor+52mm Water Level Meter Tank Indicator With Red Backlight 0-190 Ohm Water Level Gauge for Car Boat Motor 9-32V
Aliexpress UK
It is lightweight, compact, easy to carry, and is not limited by location or location. Windproof Sponge Design: The microphone is designed with a windproof sponge, more accurate sound collection, filtering the impact of wind on the sound.
eBay
240-33 Ohm Fuel Level Gauge With Fuel Level Sensor 52mm Fuel Level Meter With Red Backlight Oil Indicator Range 100-500mm Sensor
Aliexpress UK
PROMAX 6 CABLE TV ANALYSER SIGNAL LEVEL METER
eBay
Dual Analog VU Meter signal level meter Audio Amplifier Speaker Switcher Box Selector Music Spectrum Visualizer meter 3.5mm/RCA
Aliexpress UK
Noise,Temperature, and Humidity. it combines sensors. -Large screen ,Wall mount design. -Unique noise detection. -Included:Main Unit+manual+charging cable. -Led Screen display. -Temperature unit Celcius.
eBay
Audio VU Meter Pointer Music Level Meter Large Blue Display High-end with Power Amplifier DB Meter MK-4 MC-II
Aliexpress UK