Sharp Sharp R-310JK 1.2-cu.-ft. Black Countertop Microwave review: pros, cons & who it suits

THE SHORT ANSWER

Our take

Sharp R-310JK is the black, 1.2-cu.-ft. home-use model with 1,200-W output and a 12-5/8-in. turntable system. Sensor cooking and trim compatibility remain unverified.

Consider it for

Consider R-310JK if the 1.2-cu.-ft. cavity, 1,200-W output and 12-5/8-in. turntable suit your counter and dishes. Sharp's manual defines K as black and distinguishes R-310J from the lower-capacity R-308J/R-309J group. Keep the manual's home-use designation in view and verify the full label before using the tagged search..

Look elsewhere if

If you need sensor cooking or an optional trim frame, compare a model whose exact manual lists those features. For this Sharp, verify the R-310JK label and compare only against the R-310J specifications, not neighboring R-308J/R-309J figures.

Pros & cons

What could work for you, and what to consider before buying.

What works in its favor

Sharp maps K to black and distinguishes R-310J from R-308J and R-309J.
The exact manual lists 1.2 cu. ft. and 1,200 W for the R-310J.
The manual gives a 12-5/8-in. turntable system and a home-use classification.

What to weigh up

The shared manual has different values for neighboring families; use only the R-310J column.
The reviewed manual does not confirm sensor cooking or a trim-kit route.
Historical ASIN B0002ATFC2 did not verify a current exact offer.

The key details

Published product specifications
Model covered	R-310JK
Capacity	Black R-310JK is the K-suffix R-310J variant; 1.2 cu. ft.
Microwave output	1,200 W output; keep distinct from 1,100-W R-308J/R-309J figures
Cooking approach	Manual describes cooking functions; sensor cooking is not established
Installation options	Sharp calls the family home-use; no exact trim-kit path is documented
Finish and turntable	Black finish; model table gives a 12-5/8-in. turntable system

Performance figures are manufacturer claims. Source checked October 5, 2026. Regional models and included accessories can differ.

What the features mean for you

Read K as the black R-310J variant

Sharp's manual names R-310J, R-309J and R-308J, followed by a finish letter: K means black, W white and S silver. The source row's R-310JK code therefore identifies the black R-310J variant, not one of the neighboring model families. Keep this finish suffix attached in the catalog and when checking a label; the shared manual's body code identifies a family, while the suffix identifies appearance. A similar R-309J or R-308J listing cannot confirm the black R-310JK model.

Keep the R-310J capacity separate

The specifications table assigns 1.2 cu. ft. to R-310J and 1.0 cu. ft. to the R-309J/R-308J group. Do not carry the adjacent figures across model columns. The same table gives a 12-5/8-in. turntable system; check actual dish width and opening clearance for fit. Compare the dish's full width, including handles, with the tray and leave room for rotation; stated cavity volume alone does not resolve cookware clearance.

Compare the 1,200-W output rating

The exact family table lists 1,200 W output for R-310J, versus 1,100 W for the R-309J/R-308J group. Use the R-310J column for this model and do not confuse output with the separate 1,680-W electrical input shown in the table. Electrical input is not microwave cooking output, and both figures must stay attached to the right model column. Use the output to compare documented ratings, not to promise a particular cooking time.

Keep sensor features unconfirmed

The reviewed operation manual describes ordinary cooking, reheat/cook and shortcuts, but it does not establish a food-sensor cooking feature for R-310JK. Keep sensor status unknown rather than borrowing a sensor function from a newer Sharp model. Convenience menus do not by themselves prove sensor cooking, and lack of a statement here is not proof that every unit lacks it. Check the exact instructions if sensor operation is important.

Use the home-use countertop class

Sharp calls the R-310J/R-309J/R-308J family a Home Use Carousel Microwave Oven. No exact R-310JK trim-kit pairing was established in the reviewed manual, so use countertop placement and do not assume a cabinet frame is supported. This use-class statement does not confirm the unit's voltage or frequency. Check the rating plate and exact manual before deciding whether the site's electrical supply is suitable.

Verify the historical offer by suffix

Historical ASIN B0002ATFC2 returned a cache miss. Search R-310JK by its full model code and verify K on the rating label; a similar R-309J or R-308J listing has different capacity/output figures and is not a substitute. Compare the seller's listing with the manual heading and the appliance plate rather than relying on a generic black Carousel description. The tagged search locates results but does not verify offer identity, condition or availability.

What else to compare

Amana Amana RMS10DSA 0.8-Cu.-Ft. Commercial Dial-Control Countertop Microwave Commercial 0.8-cu.-ft. countertop model with 1,000-W output and six-minute dial timer. RMS10DSA is a compact, explicitly foodservice-classified countertop microwave with 1,000-W IEC output, stainless interior/exterior, a 12-in. platter and simple dial operation. Its six-minute timer and full-power-only interface distinguish it from touch-programmed commercial models.Mainstay Mainstays EM720CGA-W 0.7-Cu.-Ft. White Countertop Microwave 0.7-cu.-ft. white model with 700-W output and 10-in. turntable. The exact white EM720CGA-W identity is independently tied to B06Y5M61H3, and its family manual provides concrete size and electrical figures: 0.7 cu. ft., 700-W output, 1,050-W input and a 10-in. tray. This supports a tagged direct product link without relying on a title alone.Sharp Sharp SMC1131CB 1.1-Cu.-Ft. Black Countertop Microwave 1.1-cu.-ft. black model with 1,000-W output and 11.2-in. Carousel turntable. SMC1131CB pairs a 1.1-cu.-ft. black countertop body with 1,000-W output and an 11.2-in. tray. Sharp documents ten power levels, simple one-touch controls, auto defrost and express cook, giving the model more usable comparison points than its renewed offer title alone.

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Before you buy

What are capacity and output?

Sharp lists R-310J at 1.2 cu. ft. and 1,200 W output.

What color does the K suffix indicate?

Sharp's operation manual maps the K suffix to the black R-310J finish variant.

How large is its turntable?

The model table gives a 12-5/8-in. turntable system.

How does it differ from R-309J and R-308J?

Those adjacent models are listed at 1.0 cu. ft. and 1,100 W; R-310J is 1.2 cu. ft. and 1,200 W.

Is sensor cooking or trim compatibility verified?

Neither is established by the reviewed exact family manual.

Is ASIN B0002ATFC2 a current offer?

It returned a cache miss; use the tagged R-310JK search and verify the full suffix.

Where can I check the current price?

Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.

Sources & review basis

We use the following manufacturer documentation for the product features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.

Sharp R-308J/R-309J/R-310J operation manual ↗ — checked October 5, 2026.
Sharp-authored operation manual names R-310J/R-309J/R-308J, maps K to black, identifies the family as home-use, and lists R-310J at 1.2 cu. ft./1,200 W with a 12-5/8-in. turntable system. ↗ — checked October 5, 2026.
Historical exact-ASIN page returned a cache miss; it does not establish a current offer. ↗Paid link · We may earn a commission. — checked October 5, 2026.

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The decision