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White-light testing. A focused, portable workflow. TN420 AI482 for the defined measurement workflow.
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T500-1 is the 20/100/400/800 NTU set documented for TN500/TN420.
T500-2 is the TN500/TN420 0 NTU refill.
T500-3 is the six-vial pack for TN500/TN420.
T500-4 is catalogued for TN500/TN420.
T500-5 is catalogued for TN500/TN420 white-light meters.
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APERA INSTRUMENTS / TN420 / AI482
TN420 is the straightforward white-light choice when you need portable turbidity measurements without an electronic records workflow. Its tungsten-lamp optics, numbered vials and fixed 10-reading averaging mode keep the purchase focused on the measurement task.
Choose it when your required method calls for white-light nephelometry and local readings are enough. Choose TN500 instead if dated records, selectable TruRead reports and Windows export are part of the job. Both have the same published basic range and accuracy specification.
0-1000 NTU
Instrument range
Method/reporting scope is a separate requirement.
400-600 nm
Tungsten white light
Match the required optical method.
Fixed average
10-reading averaging
No documented PC export.
Start with the required optical method, then the recording workflow. Each card opens that product page. T500-1 is replacement standards only, not a fourth meter.
AI482
White light / essential workflow
Fixed 10-reading average. USB charging; no documented record export.
AI483
White light / recorded results
Selectable TruRead and Windows PC-Link data export.
AI481
Infrared / essential workflow
ISO 7027 optical method. Four AA batteries; readings recorded by hand.
AI486
Infrared / recorded results
ISO 7027 optical method. Four AA batteries and Windows PC-Link.
AI4205
STANDARDS ONLY / TN420 + TN500
Four sealed nonzero AMCO vials. No meter or zero. TN480 specifies T200-1.
INSTRUMENT RANGE AND METHOD SCOPE ARE DIFFERENT
Apera describes TN420 as EPA 180.1 compliant. EPA 180.1 Rev. 2.0 covers 0-40 NTU and directs dilution for samples above 40 NTU. A broader instrument scale helps characterize a sample; it does not remove the method’s preparation, checks or reporting requirements.
Manufacturer-stated method compliance is not a model-specific EPA approval certificate.
Follow the applicable method and program, including required verification, dilution and recordkeeping. A general weekly-check suggestion does not replace required method-specific checks.
WHY CHOOSE THIS CONFIGURATION
Tungsten white-light nephelometry is a different optical choice from the infrared TN480. A unit label alone does not make the methods interchangeable.
The average mode takes 10 readings at 20-second intervals. It does not offer the selectable 5/10/15/20-reading report workflow of TN500.
Recharge by USB and use the supplied case for transport. During a reading, place the instrument on a flat, level surface rather than holding it in your hand.
Normal mode takes a reading in 20 seconds. Average mode runs 10 consecutive readings at 20-second intervals and reports the average, about 200 seconds for the sequence before allowing for preparation and other checks.
There is no documented TN420 onboard logging/recall or PC-Link export function. USB charging from an adapter or computer should not be mistaken for electronic result transfer. If reportable sequences or dated records are needed, compare Alternative recording workflow: TN500.
READ THE TWO NUMBERS DIFFERENTLY
0.01 NTU
Low-range display increment
Other ranges use 0.1 and 1 NTU increments.
2% + stray light
Published reading-error specification
Accuracy: ≤±2% of reading plus stray light; stray light ≤0.02 NTU.
Worked specification example: at 1.00 NTU, the 2%-of-reading term alone is 0.02 NTU before the stray-light term. That arithmetic is not a complete method-uncertainty calculation or a promise of ±0.01 NTU measurement accuracy. Vials, sample preparation, calibration and the matrix remain part of the result.
TN420 meter; five standards at 0/20/100/400/800 NTU; six numbered sample vials; 10 mL silicone oil; microfiber cloth; 5 V/1 A adapter; USB cable; manual and case.
The complete meter kit includes zero. Replacement nonzero standards are a separate purchase; do not read a replacement-set name as all five calibration solutions.
SAMPLE PREPARATION IS PART OF THE MEASUREMENT
Use the specified 25 × 60 mm numbered sample vial and approximately 18 mL of sample. Keep the matching cap paired with it and follow the exact rinsing/mixing procedure.
Fine bubbles can raise readings; settling and light-absorbing material can change them. Keep preparation and waiting times consistent rather than averaging away a method problem.
Keep the vial clean and dry, avoid fingerprints/scratches, align its mark and close the cover. Use oil only as instructed and remove excess.
Work on a flat, level surface, not with the meter in your hand. Never pour sample into or wash the optical holder. The IP67 rating is not a direct-immersion measurement method. Turbidity is not a direct TSS mass measurement or a complete water-safety test.
The kit is supplied with five calibration values and is factory calibrated across its range. The manual permits later calibration with two or more appropriate points bracketing the expected range; local method/QC requirements still govern. Select the correct value because the instrument does not identify a standard automatically.
For low-range work, follow the manual’s zero check, warm-up and numbered-vial guidance. A display increment is not proof that an unchecked zero or contaminated vial is adequate.
The four nonzero AMCO standard vials must stay sealed. Zero-vial opening/refill instructions are different. Do not vigorously shake standards or infer that a generic shelf-life claim permits opening them.
Compatible accessory: T500-1 sealed AMCO nonzero standards is explicitly listed for TN420 and the other white-light model. Its four values are 20/100/400/800 NTU; it does not supply a meter or zero standard.
The infrared TN480 specifies T200-1 instead. Shared concentration labels do not establish universal cross-model or cross-brand compatibility.
The official family tutorial introduces the workflow. Use the exact TN420 manual for its controls, optical method, standards and software. The video is not a model-specific certification or a replacement for sealed-vial instructions.
TN420 AI482 and TN500 AI483 share a 0-1000 NTU range and the same published basic accuracy. TN420 has fixed 10-reading averaging and no documented record export; TN500 adds selectable TruRead, dated records and Windows PC-Link.
Apera describes TN420 as EPA 180.1 compliant. That is not a model-specific EPA approval or a guarantee that a laboratory procedure meets every program requirement. Use the applicable method, standards, quality controls and reporting rules.
No. EPA 180.1 Rev. 2.0 covers 0-40 NTU and directs dilution for samples above 40 NTU. The meter’s broader display range is not a claim of undiluted regulatory-method coverage across 0-1000 NTU.
No. It is the low-range display increment. Published accuracy is ≤±2% of reading plus stray light; stray light is specified at ≤0.02 NTU. Sample preparation and method uncertainty are separate.
The exact TN420 manual documents USB charging, not PC-Link export or an onboard record-recall function. Do not buy TN420 expecting the electronic reporting supplied with TN500 or TN480.
Yes. The meter kit lists standards at 0, 20, 100, 400 and 800 NTU, six sample vials, silicone oil, cloth, charger, USB cable, manual and case. Replacement T500-1 contains only the four nonzero standards, not zero.
No. Portable does not mean handheld during a reading: use a level surface. Sample goes in the capped sample vial, not directly into the optical holder. Never wash the holder or treat IP67 as a direct-immersion measurement method.
No. Turbidity is an optical scattering measurement, not a direct total-suspended-solids mass measurement or a complete potability test. A single NTU result does not establish water safety.
Review TN420 AI482 and return to the live price and ordering controls. Ask Blue Tiger Scientific to clarify the exact configuration, method or documentation requirements before ordering.
APERA INSTRUMENTS, LLC warrants this instrument to be free from defects in material and workmanship and agree to repair or replace free of charge, at the option of APERA INSTRUMENTS, LLC, any malfunctioned or damaged product attributable to the responsibility of APERA INSTRUMENTS, LLC for a period of TWO YEARS for the instrument from the delivery.
This limited warranty does NOT cover any issues due to:
The exact-model manual controls operation and configuration. The family brochure is a supplemental selection reference; it also illustrates other models and accessories. A four-value replacement set is not the complete five-standard meter-kit package. Each card opens a PDF in a new tab.
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