Mettler Toledo JS1603C/A digital gem stone balance

320 g x 0.0001 g

Mettler JS1603C/A is legal for trade and has 320 g capacity, 0.1 mg readability. Digital analytical carat balance features backlit LCD display, 3.5 inch diameter weigh pan, and motorized internal calibration.

Availability: 1 left in stock. Usually ships in 2-4 days

MSRP: $2,625.00

YOU PAY: $2,199.00

You save $426.00

Mettler Toledo Downloads
JS1603C/A gem weighing balance manual
Legal for Trade CofC 11-113
JS1603C/A legal for trade jewelery scale brochure
JS1603C/A digital balance quick guide
Gem stones can you cost you, not only in price, but in profits and reputation if there is disagreement in weight. Jewelers must be extremely precise weighing diamonds and other precious stones since a difference of 1 points (99 points to 100 points) can change the value of a stone by over 30% in some situations. A one carat diamond is the same thing as a 100 point diamond. There are 5 carts to 1 grams. Accurate weighing is a must and this Mettler diamond scale meets the requirements for most precious stone dealers and distributors.

Weighing diamonds is so important and in many states the law requires a NTEP Approved balance like the JS1603C/A. Whether you are simply weighing small loose diamonds or large polished gem stones for a collector or museum you need accurate carat weight. Choosing a Mettler Toledo carat weight balance means choosing the right weighing instrument to benefit both your professional standing and peace of mind.

MettlerToledo JS1603C/A offers a 3.54" diameter stainless steel weighing platform with a large spacious 3 door glass breeze break. This digital balance features motorized internal calibration, backlit LCD display, and Mettler's MonoBloc weighing technology. Jewelry manufacturers, diamond wholesalers and retail jewelry stores can weigh up to 1600 carats and the balance increments in 0.001 carat divisions. You can change the weigh modes very easy. In grams the JS1603C/A offering a maximum weighing capacity of 320 grams with readability of 0.0001 grams.

The Mettler Toledo JS1603C/A is a Legal for Trade Class I digital scale offering 1600 ct with 0.001 carat readability. The “d” (value of scale division) is 0.001 carats or 0.0001 grams and the “e” (value of verification scale division) is 0.01 carats or 0.001 grams. The digital balance meets the requirements as a Class I weighing device as defined by Handbook 44 and complies with the applicable technical requirements of "NIST Handbook 44: Specifications, Tolerances and Other Technical Requirements for Weighing and Measuring Devices". All this information can be reviewed by downloading the Certificate of Conformance # CofC 11-113.

When the Department of Agriculture Weights and Measures division tells you need a NTEP Class I balance that has a verification scale division of 0.001 gram the Mettler JS1603C/A meets the requirement. This high degree of accuracy makes the JS1603C/A a good choice for pharmacy compounding applications. You can learn more about verification division (e) and displayed division (d) by downloading NIST Handbook 44 - 2014 Edition here and review Section 2.

Battery Powered or AC Adapter - Mettler JS Jewelry Balances operate on either standard AA batteries or AC Adapter. Now you'll can operate your jewelry weighing balance with or without power supply. This is a huge selling point since main people in the jewelry industry attend trade shows and power is not always available or you need to pay those huge fees to have an AC receptacle at your booth. Every model in the JS, JP and JL Series can operate from a battery or AC mains supply.

Ten pre-programmed applications- Mettler JS electronic jewelry balances have 10 application modes to suit a variety of weighing needs. Note - in order to use any of these functions they must first be set on one of the user selectable function keys. These applications include piece counting, percent weighing, check weighing, statistics, totaling, multiplication factor weighing, division factor weighing, density determination, routine test, and diagnostics.

Best choice for gemstone traders - Working with diamonds and other gemstones requires absolute precision – a small weight discrepancy means loss of money. So it is essential to have a precise and reliable weighing instrument. JS diamond and gemstone scales have features that make weighing precious stones and metals easy and efficient. Motorized internal calibration provides hassle-free adjustment of your jewelry balance and the backlit LCD display allows you to be certain of your diamond weight measurements. RS232 interface allows you to connect your Mettler jewelry balance to a PC, auxiliary display, or printer. Underhook weighing is also available for specific gravity and below scale weighing.

Designed to Last - Mettler provides several quality features in its jewelry balances to assure that they fulfill you diamond jewelry weighing needs for years to come. Mettler JS1603C/A is protected from dust and moisture by a high-quality die cast aluminum housing and protected from overload damage to assures that even an accident will not fatally damage the balance. Diamond weighing balance JS1603C/A also comes with a protective cover for when the balance is not in use to assure that inadvertent damage will not happen to the weigh pan or keys. Finally, all of these features also make JS1603C/A digital gem stone balance easy to clean.

Custom Weigh Units - JS digital diamond carat balances offer two ways of creating your own customized weigh units by using multiplication factor weighing which multiplies the sample weight value in grams by a predefined factor and calculates it to a predefined number of decimal places. Another weighing option is division factor weighing which divides the sample weight value in grams by a predefined factor and rounds it to a predefined number of decimal places.

Self Diagnostic Testing- Use the JS carat jewelry balance's diagnostic application to find errors with the scale faster and more efficiently. In order to use the diagnostics functions of JS1603C/A digital analytical balance it must be connected to a PC or printer in order to display results. Diagnostics tests that are run on your digital balance include a repeatability test, display test to assure that the backlit LCD display display is working properly, key test to test the operation of the keys of the balance, and motor test to test the motor used for internal calibration. This motor test is only applicable if your digital balance has internal calibration. Diagnostics function of the JS1603C/A also allow user to view or print the history of the digital balance including the operation time, number of weighings, number of key presses, and number of motor movements.

Accurate and Fast - Digital balances from Mettler Toledo are designed to deliver accurate, trustworthy and repeatable results every time. JS digital precision balances feature a MonoBloc weighing cell for a robust and accurate heart to JS digital balance with less hysteresis than other forms of weigh cells. Motorized internal calibration assures quick and easy automatic calibration so you can start weighing sooner. To be sure your digital balance is level and accurate, JS digital balances come with adjustable leveling feet and bubble.

JP or JS Carat Jewelry Balance ? The main difference between the JS and JP carat jewelry balances is the number of additional features. For example, with the JP carat weighing scales you get Mettler's FACT automatic internal calibration system. You also get two data interfaces, either two (2) RS232 or one (1) RS232 and one (1) USB. The display of a JP is also different from that of a JS, JP has a high contrast HCD display while JS has a backlit LCD display. Finally, JP jewelry balance have built in density determination software to augment your weighing options.

If you noticed the Mettler JS1603C/A looks similar to the Mettler Toledo ML304E Classic ML Analytical Series. The Mettler JS balances are sold to the jewelry marketplace while the Mettler Toledo Classic ML balances are sold to the laboratory marketplace. There are some minor differences between the and we always recommend you download the user manual to understand the product better and if you have any questions give us a call at 978-521-7095 and a product specialist is available to help answer your questions.

Capacity (grams) 320 g
Readability (milligrams) 0.1 mg
Capacity (carats) 1600 ct
Readability (carats) 0.001 ct
Linearity ±0.3 mg / 0.002 ct
Repeatability ±0.1 mg / 0.001 ct
Weighing Units g, kg, mg, ct, lb, oz, ozt, gn, dwt, momme, mesghal, tola, baht, Hong Kong taels, Singapore taels, Taiwan taels,
Application Modes Weighing, Underhook Weighing, Piece Counting, Percent Weighing, Check Weighing, Statistics, Totaling, Multiplication Factor Weighing, Division Factor Weighing, Density Determination, Routine Test, Diagnostics
Tare Range Full Capacity by Subtraction
Minimum weight (acc. to USP) 0.21 g
Minimum weight (U=1%, k=2) 0.014 g
Stabilization Time 2 seconds
Operating Temp Range 50°F (10°C) to 86°F (30°C)
Sensitivity to temperature drift (10°C - 30°C) 3 ppm/°C
Below Balance Hook YES
Protection IP54 rated with weigh pan
Housing Die-cast aluminum, painted
Legal For Trade YES - CofC 11-113 Legal for Trade
x Readability (g)
1600 ct x 0.01ct (one hundradth of a carat)
320 g x 0.001g (one milligram)
Accuracy Class Class I - weighing of gold and jewelry
Calibration Internal calibration or optional 200g mass
Interface Single RS232 only
Power Requirements AC adapter or 8 AA alkaline batteries (not included) for 8-15 hours of use
Display Type LCD
Backlight YES
Weighing Technology MonoBloc
Height of Draft Shield 9.25 inches
Pan Size (Diameter) 3.5 inch diameter
Balance Dimensions (W x D x H) 7.6 x 11.4 x 13 in / 193 x 290 x 331 mm
Place of Origin Made in CHINA
Warranty 1 Year Limited Manufacturer's Warranty
Gross Weight 8.6 lb / 3.9 kg
Shipping Weight 15 lb / 6.8 kg
What's included
AC Adapter
Protective Cover
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Additional Info
Additional Info
Brand Mettler Toledo
Capacity x Readability 320 g x 0.0001 g
Readability 0.1 mg
Weight Modes Carats, Grains, Milligrams, Pounds, Ounces, Pennyweight, Grams, Troy Ounces, KiloGrams
Functions Percent Weighing, Totalization, Density, Statistics, Diagnostics, Custom Weigh Units
Features Legal For Trade, Parts Counting, RS-232c, Internal Calibration
Legal for Trade Yes Legal for Trade
Construction Solid Diecast Metal Base Housing, Stainless Steel Weighing Pan, LCD Display, Magnetic Force Motor MonoBloc Weigh Cell
Calibration motorized internal calibration or optional external 200g mass
Communication RS-232
Platform size (inches) 3.5 diameter
Power Requirements battery NOT included, 120V AC Adapter included
Manufacturer Warranty (years) 1
Additional info Motorized internal calibration comes standard.
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