Item Description: Polarchem pH Meter Buffer Solution 4.00, 7.00 or 10.00pH - 500ml Bottle (1 Pint/16 ounces)Product Specs:* 500 ml Bottles (roughly 1 Pint) - Half Liter* Temperature Charts are included on each bottle of solution. * Expiration dates on every bottle, usually with more than 18 months left.* pH 7.00 is the most commonly used Buffer Solution. Use this product to keep your pH Meters running at optimum levels! You choose which Buffer Solution you need! 4.00 pH. 7.00 pH. 10.00 pH. This product is for only ONE BOTTLE ($10.49/Bottle), but you can buy as many as you need! If you need 2 bottles, purchase 2 here! If you need 10, purchase 10 here! LET US KNOW WHICH pH'S YOU NEED WHEN YOU PAY! IF WE DON'T KNOW WHAT YOU WANT, YOUR PAYMENT WILL BE REFUNDED! To ensure optimum accuracy time after time, calibrate your instruments using the Polarchem pH Buffer Solutions. Ideal for 1-Point, 2-Point or 3-Point Calibrations! Don't buy Kool-aid type pouches that rely on you having access to deionized water and lab equipment to mix the solution. Buy smart, buy a premixed product to save you time and peace of mind! SUGGESTED PROCEDURES:Proper electrode storage maximizes electrode performance and extends electrode life. The electrodes should not be stored in distilled water. The filling solution will be diluted and the electrode response will be slow. If using a refillable pH electrode, the fill hole should be covered overnight and during storage. The fill hole cover must be removed during calibration and measurement to ensure a uniform flow of electrode filling solution. The best way to store the electrode is to read the included manual. We also catrry an Electrode Storage Solution at our eCRATER Store! Maintenance and cleaning: The electrode should be inspected weekly for scratches, cracks, or salt crystalization. Follow instructions and do not clean excessively. Calibration: To verify electrode slope and proper function, calibration must be performed each day before any samples are measured and recalibrated every couple of hours to ensure that correct slope is used to calculate the sample pH. If the user is unsure of the sample range, a pH test strip can quickly determine the approximate sample pH. TIP: Regularly, the electrode should be calibrated with 2 or 3 buffers or standards that bracket the expected sample range. Rinsing between measurements: Rinsing prevents contamination by carryover on the electrodes. Tip: The electrode should be rinsed with deionized water or an aliquot of the next buffer or sample. Caution: the pH electrode glass bulb should not be wiped. Temperature: To account for pH slope, buffer and sample changes, a separate or integrated automatic temperature comp. probe or digital LogR should be used. pH is readily temperature correctable. Shipping:Domestic: All items are shipped out USPS Priority Mail or UPS Ground depending on where you live (shortest shipping time is what we look for). $7.50 for the first bottle and $1.50 for each bottle after. For example, 3 bottles would be $10.50 ($7.50 + $1.50 + $1.50 = $10.50)International: Shipping via USPS Global Priority Mail is $15.00, $12 to Canada. For an additional $15.00 we can ship out via USPS Express Mail!We Carry 20ml Pouches, 120ml/4 ounce Bottlesand 4 Liter Jugs too! Check our eCRATER Store for those items and more!pH Buffer Pouches: 20ml Pouches - $1.25 eachpH Buffer Bottles - 120ml/4 Ounces - $4.99 eachpH Buffer Bottles - 500ml/16 Ounces - $10.49 eachPh Buffer Jugs: 4 Liter Jugs - $39.99 eachHanna pH Meter & ORP Meter Storage Solution: For the best results, store your pH Meter Pribes in this fluid!We carry pH Meters too!Check out our eCRATER Store (www.nisupply.com)! More items listing weekly!National Industrial Supply 2767 Maricopa StreetTorrance, CA 90503, USA310.748.6858310.833.7306 FaxE-mail: chardowner@yahoo.com We accept Paypal too!On Jul-30-07 at 18:46:36 PDT, seller added the following information: PLEASE BE SURE TO TELL US WHICH pH BUFFERS YOU NEED AT THE TIME OF PURCHASE! OTHERWISE WE E-MAIL YOU AND WAIT FOR YOUR REPLY!IF YOU PAY VIA WWW.PAYPAL.COM, PUT IT IN THE "NOTES" SECTION (OR WHATEVER THE SECTIONS NAME IS!) OF YOUR PAYMENT! IF WE DON'T HEAR FROM YOU, YOUR PAYMENT WILL BE RETURNED!