Kern EWJ 300-3 precision balance 300 g / 0.001 g
€522.00
% Manufacturer's RRP: €580.00 10% below manufacturer's RRP
- Weighing range 300 g, readability 0.001 g
- Reproducibility 0.003 g, linearity ± 0.005 g
- Minimum unit weight when piece counting 2 mg (laboratory) or 20 mg (standard conditions)
- Internal automatic adjustment every 2 h, load cell IP65, checkweighing
- Small removable draught shield (weighing chamber 134 x 128 x 80 mm), weighing plate Ø 80 mm
- RS-232 and USB device, Bluetooth optional ex works, backlit LCD, rechargeable battery optional
ⓘ This product description has been translated from German using AI. Despite careful review, we do not guarantee that the translation is error-free; in case of doubt, the German version shall prevail.
Product information "Kern EWJ 300-3 precision balance 300 g / 0.001 g"
The Kern EWJ is a precision balance with strain gauges, internal automatic adjustment and a load cell protected against dust and splash water (IP65). Nine models weigh from 300 g to 6,000 g and read to 0.001 g, 0.01 g or 0.1 g. Four of these (EWJ 600-2M, EWJ 600-1M, EWJ 6000-1M, EWJ 6000-1SM) have a verification value and can optionally be ordered with a conformity assessment under the NAWI Directive (2014/31/EU). The other five are designed without a verification value.
Automatic adjustment and protected load cell
The balance adjusts itself every 2 h, time-controlled, with an internal weight. According to Kern, this makes the location independent of changes in the room. The aluminium load cell is silicone-coated and has an IP65 rating. According to the data sheet, the display has no IP protection, so the balance as a whole is not splash-proof. A bar graph capacity display shows the weighing range that is still free. All main functions have their own button.
Features
When weighing within a tolerance range (checkweighing), a visual and audible signal supports portioning, dosing and sorting. In addition, there are piece counting, percentage determination and the Net-Total function of the formulation and totalling level. For the EWJ 300-3, Kern also lists statistics, formulation and totalling functions. The models without a verification value display kg, g, t and many other units; according to the specifications, the four models with a verification value display only g. The backlit LCD has digits 21 mm high.
Comparison of designs
The EWJ 300-3 and EWJ 300-3H models weigh up to 300 g with a readability of 0.001 g and have a weighing pan with a diameter of 80 mm. The EWJ 300-3 has a small, removable draught shield (weighing chamber 134 x 128 x 80 mm). The EWJ 300-3H has a large glass draught shield with three sliding doors (weighing chamber 155 x 175 x 217 mm) and is 321 mm high. Up to 600 g are covered by the EWJ 600-3 (0.001 g), EWJ 600-2M (0.01 g) and EWJ 600-1M (0.1 g), all with a weighing plate Ø 120 mm and removable draught shield. The EWJ 3000-2 weighs up to 3,000 g at 0.01 g on a plate with a diameter of 135 mm. The three 6-kg models (the EWJ 6000-2 with 0.01 g, and the EWJ 6000-1M and EWJ 6000-1SM with 0.1 g) have a rectangular weighing pan measuring 155 x 145 mm. According to Kern, the EWJ 600-3 and EWJ 6000-2 have a resolution of 600,000 points and a stabilisation time of 6 s; the other models take 2 s.
Special features of individual models
The EWJ 600-1M has a customer display on the rear and a display without auxiliary indicating device (e = d = 0.1 g). Kern describes it as designed for open points of sale and recommends ordering the conformity assessment together with it for applications subject to mandatory verification. According to the data sheet, it operates at 0 °C to 40 °C and has no data interface. The EWJ 6000-1SM comes without a standard data interface; Bluetooth is optionally available ex works. All other models have RS-232 and USB device; here too, Bluetooth (BTC or BLE) is optionally available ex works.
Power and operation
The plug-in mains adaptor operates at 100 V to 240 V and 50 Hz or 60 Hz. An internal rechargeable battery is optional (charging time 6.5 h, operating time 32 h with and 57 h without backlight). In rechargeable battery operation, the balance switches off after 30 s to 60 min; the interval can be selected. The plastic housing has a base area of 220 x 340 mm. The height is 105 mm; for the EWJ 300-3, EWJ 600-2M and EWJ 600-1M models, it is 90 mm. The permissible range is 10 °C to 35 °C and up to 80 % humidity.
Typical applications
- Jewellery and gold trade: units such as ct, dwt and ozt; customer display on the EWJ 600-1M
- Quality control: checkweighing with visual and audible signals
- Laboratory applications and dental laboratories: weighing to 0.001 g with draught shield
- Plastics technology: piece counting and percentage determination
Models at a glance
| Model | Weighing range (Max) | Readability (d) | Reproducibility | Linearity | Stabilisation time | Minimum unit weight (laboratory / normal) | Weighing pan | Net weight approx. | DAkkS calibration certificate (item no.) |
|---|---|---|---|---|---|---|---|---|---|
| EWJ 300-3 | 300 g | 0.001 g | 0.003 g | ± 0.005 g | 2 s | 2 mg / 20 mg | Ø 80 mm | 2.2 kg | 963-127 |
| EWJ 300-3H | 300 g | 0.001 g | 0.003 g | ± 0.005 g | 2 s | 2 mg / 20 mg | Ø 80 mm | 3.6 kg | 963-127 |
| EWJ 600-3 | 600 g | 0.001 g | 0.003 g | ± 0.005 g | 6 s | 2 mg / 20 mg | Ø 120 mm | 2.2 kg | 963-103 |
| EWJ 600-2M | 600 g | 0.01 g | 0.01 g | ± 0.03 g | 2 s | 20 mg / 200 mg | Ø 120 mm | 3.2 kg | 963-127 |
| EWJ 600-1M | 600 g | 0.1 g | 0.1 g | ± 0.3 g | 2 s | 200 mg / 2 g | Ø 120 mm | 3.2 kg | 963-127 |
| EWJ 3000-2 | 3,000 g | 0.01 g | 0.03 g | ± 0.05 g | 2 s | 20 mg / 200 mg | Ø 135 mm | 3.2 kg | 963-127 |
| EWJ 6000-2 | 6,000 g | 0.01 g | 0.03 g | ± 0.05 g | 6 s | 10 mg / 100 mg | 155 x 145 mm | 3.2 kg | 963-104 |
| EWJ 6000-1M | 6,000 g | 0.1 g | 0.1 g | ± 0.3 g | 2 s | 100 mg / 1 g | 155 x 145 mm | 3.4 kg | 963-128 |
| EWJ 6000-1SM | 6,000 g | 0.1 g | 0.1 g | ± 0.3 g | 2 s | 100 mg / 1 g | 155 x 145 mm | 3.4 kg | 963-128 |
Models with verification value
| Model | Verification value (e) | Accuracy class | Minimum load (Min) | Conformity assessment (item no.) |
|---|---|---|---|---|
| EWJ 600-2M | 0.1 g | II | 0.5 g | 965-216 |
| EWJ 600-1M | 0.1 g | II | 5 g | 965-216 |
| EWJ 6000-1M | 1 g | II | 5 g | 965-217 |
| EWJ 6000-1SM | 1 g | II | 5 g | 965-217 |
Technical details
These values apply to all models. Deviating values are given in the model tables.
| Weighing system | Strain gauge |
| Adjustment | Automatic adjustment with internal weight, every 2 h |
| Load cell | Aluminium, silicone-coated, IP65 |
| Weighing pan material | Stainless steel |
| Display | LCD, backlit, digit height 21 mm |
| Housing | Plastic, 220 x 340 mm base area, 90 mm or 105 mm high (EWJ 300-3H with glass draught shield 321 mm) |
| Power supply | Plug-in mains adaptor, 100 V to 240 V AC, 50 Hz or 60 Hz; rechargeable battery optional |
| Ambient temperature | 10 °C to 35 °C (EWJ 600-1M: 0 °C to 40 °C) |
| Humidity | up to 80 % |
| Conformity assessment under NAWI (2014/31/EU) | optional, ex works only, only for EWJ 600-2M, EWJ 600-1M (item no. 965-216) and EWJ 6000-1M, EWJ 6000-1SM (item no. 965-217) |
| DAkkS calibration certificate | can be ordered separately, item no. see model table |
| Warranty (manufacturer) | EWJ 300-3, 300-3H, 600-3, 3000-2, 6000-2: 36 months; EWJ 600-2M, 600-1M, 6000-1M, 6000-1SM: 24 months; in each case according to Kern, excluding wear parts |
Conformity assessment and calibration
A conformity assessment under the NAWI Directive (2014/31/EU) is optional for the four models with a verification value (see table for item numbers). It can only be ordered ex works together with the balance; according to Kern, a subsequent conformity assessment is not possible. To place an order, Kern needs the full address of the installation site. A DAkkS calibration certificate can be ordered separately for all models. The confirmation of manufacturer specification (969-517) is only available in conjunction with the DAkkS calibration certificate.
Scope of delivery
- Kern EWJ precision balance with stainless steel weighing pan (EWJ 300-3, EWJ 300-3H, EWJ 600-3, EWJ 600-2M, EWJ 600-1M with draught shield)
- Working protective cover
- Plug-in mains adaptor with country adaptors for EU, UK, US and CH
Warranty
According to Kern & Sohn, the EWJ 300-3, EWJ 300-3H, EWJ 600-3, EWJ 3000-2 and EWJ 6000-2 come with a 3-year warranty and the EWJ 600-2M, EWJ 600-1M, EWJ 6000-1M and EWJ 6000-1SM come with a 2-year warranty. Kern grants 3 years on products with a list price of €500 or more and 2 years on products below that and on components; wear parts such as batteries and rechargeable batteries are excluded. Warranty repairs are carried out by Kern or by a Kern dealer.
Downloads
Regulatory information
As electrical devices, the balances fall under the ElektroG. The manufacturer Kern & Sohn GmbH is registered under the WEEE registration number DE 80821200. How to return old appliances is described on the page Environment and disposal.
Individual requirements and procurement service
Working protective covers (EWJ-A04, EWJ-A04S05 with 5 pieces), the rechargeable battery EWJ-A06 (Li-ion, 7.4 V, 2,600 mAh), the plug-in mains adaptor YKA-11, the anti-vibration table YPS-03, the anti-vibration plates YPS-04 and YPS-05, thermal printers (YKC-01, YKH-01), the dot-matrix printer YKG-01, the needle printer YKT-01, the RS232 Bluetooth adapter YKI-02, RS232 Ethernet converters (YKI-10, YKI-11), the RS232 WLAN converter YKI-12, the RS232 to USB converter (AFH 13) and the RS-232 interface cable CFS-A01 are also available (selection depending on the interface of the model). For the EWJ 300-3H, Kern lists the dust cover ABS-A08. Safety Sets are available as 315-312-407 for the EWJ 3000-2 (100 g M1, 2,000 g F2) and 315-208-304 for EWJ 300-3 and EWJ 300-3H (10 g F2, 200 g F1). Enquiries are handled via our procurement service.
| Weighing range (Max): | 300 g |
|---|---|
| Readability (d): | 0.001 g |
| Verifiable: | no |
| Design: | EWJ 300-3 · 300 g |
| Power supply: | Mains operation |