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DeWalt DCF870B, bare tool: 20V XR Brushless Cordless 1/4 in. Quiet Hydraulic Impact Driver (Tool-Only) (photograph from the Home Depot listing)

DeWalt · 20V MAX

DCF870B

Tool Nutlisting 53393166139686

20V XR Brushless Cordless 1/4 in. Quiet Hydraulic Impact Driver (Tool-Only)

bare tool

Retailer says · Last observed price

$159.00

was $219.00 · a 27% claim

Retailer's “was” price Claim witnessed

last observed available online · Tool Nut ·

Our record

highest witnessed
$219.00
lowest witnessed
$159.00

We conclude

Recorded verdict · last observed Oct 9 2026 · not confirmed current

Today’s price is 27% below the 37-day reference. The claimed reference was last offered on Oct 7 2026.

Coverage · developing record · watched since Sep 3 2026 · point-by-point since Sep 3 2026 · 33 price-days · 4 coverage gaps · 0 continuity breaks

View at Tool Nut · $159.00 All offers Price record
Watch this exact offer

Alerts fire on our verdict, never on retailer banners. At most six price-alert emails in any rolling seven days.

WTV-DEWALT-DCF870B-TOOLNUT-20261010-0805

This exact Audit record

Wasitever · Claim Audit

DCF870B

20V XR Brushless Cordless 1/4 in. Quiet Hydraulic Impact Driver (Tool-Only)

DeWalt · 20V MAX · bare tool · Tool Nut · online national

Retailer says
$159.00 · was $219.00 — a 27% claim — Tool Nut
Our record
highest witnessed $219.00 Sep 3 2026lowest witnessed $159.00 Oct 9 2026
We conclude
Recorded verdict · last observed Oct 9 2026 · not confirmed current

Today’s price is 27% below the 37-day reference. The claimed reference was last offered on Oct 7 2026.

Coverage · developing record · watched since Sep 3 2026· point-by-point since Sep 3 2026· 33 price-days · 4 coverage gaps · 0 continuity breaks· batch complete

Complete witnessed history

Price record

This is the independent record for the Tool Nut listing above. It does not borrow prices, claims, or observations from another retailer.

Evidence instrument · 90-day reference rule · 37-day observed span

Offered price vs. their claimed ‘was’

Tool Nut · Sep 03 2026–Oct 09 2026

Offered price vs. their claimed ‘was’ TRUE −27% VS 37D. The offered price is $159 as of Oct 9 2026; the retailer claims a $219 reference. The plotted record breaks across 4 missing observation runs. The vertical price scale visibly starts at $150. The 90-day rule selects its reference. This record contributes a 37-day observed span; all 33 price-days and 4 missing runs are shown. Daily tracking had not yet begun in the earlier part of the rule frame; that time is not a coverage gap. $160$180$200$2201FULL POINT-BY-POINT RECORD33 PRICE-DAYS · 37D OBSERVED SPAN$159 · OFFERED · Oct 9$219 · THEIR CLAIMED ‘WAS’Sep 3Sep 21Oct 9 BROKEN SCALE · STARTS AT $150
Offered price vs. their claimed ‘was’ TRUE −27% VS 37D. The offered price is $159 as of Oct 9 2026; the retailer claims a $219 reference. The plotted record breaks across 4 missing observation runs. The vertical price scale visibly starts at $150. The 90-day rule selects its reference. This record contributes a 37-day observed span; all 33 price-days and 4 missing runs are shown. Daily tracking had not yet begun in the earlier part of the rule frame; that time is not a coverage gap. $160$180$200$2201FULL POINT-BY-POINT RECORD · 33 PRICE-DAYS · 37D OBSERVED SPAN$159 · OFFERED · Oct 9$219 · THEIR CLAIMED ‘WAS’Sep 3Sep 21Oct 9 BROKEN SCALE · STARTS AT $150
Offered price vs. their claimed ‘was’ TRUE −27% VS 37D. The offered price is $159 as of Oct 9 2026; the retailer claims a $219 reference. The plotted record breaks across 4 missing observation runs. The vertical price scale visibly starts at $150. The 90-day rule selects its reference. This record contributes a 37-day observed span; all 33 price-days and 4 missing runs are shown. Daily tracking had not yet begun in the earlier part of the rule frame; that time is not a coverage gap. $160$180$200$2201FULL POINT-BY-POINT RECORD · 33 PRICE-DAYS · 37D OBSERVED SPAN$159 · OFFERED · Oct 9$219 · THEIR CLAIMED ‘WAS’Sep 3Sep 21Oct 9 BROKEN SCALE · STARTS AT $150

No observations · 4 separate runs; dates in the point ledger.

  • offered, witnessed
  • their claimed “was”
  • no observations
  • detached price fact
Chart notes and detached evidence

Why this form

The 90-day rule selects its reference. This record contributes a 37-day observed span; all 33 price-days and 4 missing runs are shown. Daily tracking had not yet begun in the earlier part of the rule frame; that time is not a coverage gap.

Every line uses reduced price-days for one exact retailer offer. Both series share the coverage mask; intraday and Class B facts remain detached marks. The receipt ledger below is the complete text alternative.
Price distribution · 33 price-days

Price-day distribution · M2

Where the last observation sits

Tool Nut · 33 price-days

Price-day distribution for this exact offer Among the lowest 10% of prices we’ve witnessed for this exact offer. 0% of 33 price-days were lower than the last observed $159.

Last observed · $159

$159$219

Among the lowest 10% of prices we’ve witnessed for this exact offer.

0% of 33 price-days were lower · 1 matched the last observed $159

  • $159 · 1d
  • $186.15 · 2d
  • $219 · 30d
Price history, changes, and missing observations — 11 entries

Point ledger · stable row IDs

Price history, changes, and missing observations

11 entries · change points, gaps, and dated facts

Complete dated text alternative to the price chart. A gap records missing knowledge; it never records an offer change.
DateRecord eventOfferedClaimed “was”Receipt note
Point-by-point record begins $219.00 — no observation
Receipt · receipt-20260903-record-start

Class C · complete observation.

Source · WTV-COLLECT-00087

Class C · complete observation.

Source · WTV-COLLECT-00087
No observations · 1 day — no observation — no observation
Receipt · receipt-20260921-gap

No observations in the published record.

Source · WTV-GAP-dewalt-dcf870b-TOOLNUT-20260921-20260921

No observations in the published record.

Source · WTV-GAP-dewalt-dcf870b-TOOLNUT-20260921-20260921
Complete observations resume $219.00 — no observation
Receipt · receipt-20260922-record-resumes

Class C · complete observation.

Source · WTV-COLLECT-00391

Class C · complete observation.

Source · WTV-COLLECT-00391
Offer and retailer claim changed · $219 → $186.15; — no observation → $219 $186.15 $219.00
Receipt · receipt-20260923-combined-change

Class C · complete observation.

Source · WTV-COLLECT-00411

Class C · complete observation.

Source · WTV-COLLECT-00411
No observations · 1 day — no observation — no observation
Receipt · receipt-20260925-gap

No observations in the published record.

Source · WTV-GAP-dewalt-dcf870b-TOOLNUT-20260925-20260925

No observations in the published record.

Source · WTV-GAP-dewalt-dcf870b-TOOLNUT-20260925-20260925
Complete observations resume $219.00 — no observation
Receipt · receipt-20260926-record-resumes

Class C · complete observation.

Source · WTV-COLLECT-00464

Class C · complete observation.

Source · WTV-COLLECT-00464
No observations · 1 day — no observation — no observation
Receipt · receipt-20261005-gap

No observations in the published record.

Source · WTV-GAP-dewalt-dcf870b-TOOLNUT-20261005-20261005

No observations in the published record.

Source · WTV-GAP-dewalt-dcf870b-TOOLNUT-20261005-20261005
Complete observations resume $219.00 — no observation
Receipt · receipt-20261006-record-resumes

Class C · complete observation.

Source · WTV-COLLECT-00652

Class C · complete observation.

Source · WTV-COLLECT-00652
No observations · 1 day — no observation — no observation
Receipt · receipt-20261008-gap

No observations in the published record.

Source · WTV-GAP-dewalt-dcf870b-TOOLNUT-20261008-20261008

No observations in the published record.

Source · WTV-GAP-dewalt-dcf870b-TOOLNUT-20261008-20261008
Complete observations resume $159.00 $219.00
Receipt · receipt-20261009-record-resumes

Class C · complete observation.

Source · WTV-COLLECT-00710

Class C · complete observation.

Source · WTV-COLLECT-00710
Latest complete observation $159.00 $219.00
Receipt · receipt-20261009-current

Class C · complete observation.

Source · WTV-COLLECT-00710

Class C · complete observation.

Source · WTV-COLLECT-00710
Coverage and record credentials

Record credentials

What this page knows

Exact scope
DeWalt · DCF870B · bare tool · Tool Nut · online national · config cfg-dewalt-dcf870b
Watched since
Sep 3 2026
Point-by-point since
Sep 3 2026
Observation record
33 price-days · collection walk; cadence not yet set
Latest covering batch
complete · 2828/2828 items · WTV-COLLECT-00710
Observation classes travel with the price record. They are never silently blended.
ClassRetained evidenceRendering law
Class A0 price-daysretained complete observations
Class B0 dated markdurable summary fact; never a curve
Class C33 price-daysnew longitudinal record

Coverage gaps · 4 coverage gaps · 0 continuity breaks

  • Sep 21 2026 · 1dNo observations in the published record.
  • Sep 25 2026 · 1dNo observations in the published record.
  • Oct 5 2026 · 1dNo observations in the published record.
  • Oct 8 2026 · 1dNo observations in the published record.