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 Six FT-243 Crystals 40 Meters 7.200 7.217 7.225 7.243 7.275 7.300 MHz QRP QRO US $19.95 
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 Five FT-243 Crystals 40 Meters 7.125 7.140 7.150 7.173 7.188 MHz QRP QRO US $21.95
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 40 Meter HAM-Band CW crystal - 7011.111 kHz - HC6/U US $3.49
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 Swan MX-100 17 Meter Crystal US $3.99
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 Swan MX-100 10 Meter Crystal US $3.99
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 Used Heathkit Manual for 6-Meter Crystal Converter, XC-6 in VG Condition, 1959 US $4.99
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 Crystals Lot of 4 2 Meter Band from GONSETT Communicator III US $5.00
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 40 meter MOCK-FT243 Crystal Kit - 7.200 MHz US $2.49
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 40 meter MOCK-FT243 Crystal Kit - 7.159 MHz US $2.49
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 Crystals for 40-Meters, FT-243, 8pc. US $15.50
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 Crystals for 40-Meters, 7pc. US $10.00
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 DRAKE C-LINE 37.1MHz (11 METER 26.0-26.5 VFO) CRYSTAL T-4XC R-4C TR-4C US $25.00
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 SW-1 20 Meter Transistor QRP Crystal RF Transmitter Module Amateur Ham Radio US $25.00
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 SW-1 30 Meter Transistor QRP Crystal RF Transmitter Shortwave Amateur Ham Radio US $25.00
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 (6) Miniature Crystal Controlled 20-Meter QRP TRANSMITTERS US $12.00
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 YAESU FT-101-E 11 METER CRYSTAL COVERS 27.000 MHz -27.500 MHz Channels 1 to 40 US $19.99
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 6 Meter HAM-Band crystal - 8400 kHz (X6 = 50.400 AM Calling Freq.) - HC6/U US $3.49
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 YAESU FT-101 SERIES 80 METER CRYSTAL 9.520 MHz FREE SH US $13.95
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 YAESU FT-101 SERIES 40 METER CRYSTAL13.020 MHz FREE SH US $13.95
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 YAESU FT-101SERIES 20 METER CRYSTAL 20.020 MHz FREE SH US $13.95
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 YAESU FT-101SERIES 15 METER CRYSTAL 27.020 MHz FREE SH US $12.95
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 Two ham radio 6 meter crystals: 50.310 & 50.250 MHz US $9.99
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 Vintage Johnson Viking 1 2 Crystal 160 meter + coil Switch Transmitter Ham Radio US $18.00
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 4 Ft-243 crystals for 75 meter phone Very nice!!! US $9.99
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 (6) Crystal-Controlled 10-Meter Band QRP TRANSMITTERS US $11.00
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 (4) 10-Meter Crystal Controlled QRP TRANSMITTERS for NOVICES US $11.95
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 YAESU FT-101B 10-D METER CRYSTAL 35.520 MHz FREE SHIP US $13.95
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 20 meter MOCK-FT243 Crystal Kit - 14.31818 MHz US $2.49
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 SIX METER 8-MHz FT-243 CRYSTALS ( Many to choose - You pick ) US $4.95
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 YAESU FT-101-E 10 METER CRYSTALS COVERS 28 to 30 MHZ YOU ARE BIDDING ON 4 XTALS US $40.99
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 (2) 80-Meter Band CRYSTALS ● HC-49 ▲GO QRP▲ US $7.50
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 (5) 80-Meter Low-Power Crystal-Controlled Transmitters US $8.95
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 (6) 10-Meter Crystal Controlled QRP HAM TRANSMITTERS - for Techs and Novices US $9.95
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 M.P. CO 160 M Meter Ham Crystal 1.8432 MHz HC-18/U Lot of 2. FREE SHIPPING!! US $9.45
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 6 meter MOCK-FT243 Crystal Kit - 8.4672 / 50.803 MHz US $2.49
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 NEW YAESU FT7B, FT301 and TEMPO1 11 METER CRYSTAL PLUG-IN US $44.95
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 75 meter HAM BAND crystal - 3525.000 kHz - HC-6 holder US $1.99
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 15 meter HAM BAND (CW) crystal - 21.078 MHz - HC-25/U holder US $1.49
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 YAESU FT- 101FT-101B/E/EE/EX/F SERIES 10 METER CRYSTALS SET OF 4 FREE SHIPPING US $44.95
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 NEW YAESU FT101ZD FT707 XTAL 11 METER CRYSTAL PLUG-IN US $49.95
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 NEW YAESU FT-101 E Series 11 METER CRYSTALS SET PLUGIN US $49.95
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 (5) 20-Meter QRP HAM Radio CRYSTALS - GO QRP! US $4.95
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 YAESU FT-101/B/E/EE/EX 11 METER CRYSTAL 33.520 27.500Mhz to 28.000 Mhz US $19.95
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 NEW KENWOOD TS820 RESTORE 10 METER CRYSTALS PLUG-IN US $38.95
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 10 meter MOCK-FT243 Crystal Kit - 28.224 MHz US $2.49
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 (2) 160-Meter Band - Transmitter CRYSTALS US $7.95
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 YAESU FT-101-E 11 METER CRYSTALS COVERS 26.500 MHz -28.000 MHz - 3 CRYSTALS US $39.99
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 YAESU FT-101-E 11 METER CRYSTAL COVERS 26.500 MHz -27.000 MHz Below Channel 1 US $19.99
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 YAESU FT-101-E 10 METER CRYSTALS COVERS 28.000 TO 28.500 10-A 34.020 MHz US $19.99
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 YAESU FT-101-E 10 METER CRYSTALS COVERS 28.500 TO 29.000 10-B 34.520 MHz US $19.99
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 YAESU FT-101-E 10 METER CRYSTALS COVERS 29.000 TO 29.500 10-C 35.020 MHz US $19.99
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 TEN Meter HC-6/U CRYSTALS (You pick) US $2.99
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 FORTY Meter HC-6/U CRYSTALS (You pick) US $4.99
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 8 MHz HC-6/U CRYSTAL for 2 Meters (You pick) US $2.49
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 YAESU FT-101E SERIES TRANSCEIVER CRYSTAL *20 METER (20.020)* US $13.99
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 YAESU FT-101E SERIES TRANSCEIVER CRYSTAL *80 METER (9.520)* US $13.99
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 YAESU FT-101E SERIES TRANSCEIVER CRYSTAL *40 METER (13.020)* US $13.99
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Meter Crystal
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Differences with the pH Readings between Two Meters
There are observed differences in the field between two pH meters' readings. This can get many growers confused with the true value of the pH of the medium on which their plants grow. This article will help answer the confusion of the readings.
The acidity or alkalinity of the soil or solution, which is very important with growing plants, is measured with a pH meter. pH, or the power of Hydrogen, is the concentration of H+ ions for acidic solutions and OH- ions for basic solutions. The pH is a critical factor in the plant's growth as it is directly related to the availability of the nutrients.
This is especially important when it refers to hydroponic growing.
Some growers noticed that their pH readings usually fluctuate when tested with two different meters in the same nutrient solution. There are several reasons that can be attributed for this fluctuation.
One of the possible reasons is that the two pH meters use different brands of batteries. One set of batteries used in one pH meter might be older than the other battery used in the other meter.
Though the batteries supply the same voltage, the power from older batteries is normally weaker than the newer one. A, even a slight corrosion on batteries can also cause differences in pH readings.
Unseen dirt on probes can also affect the pH reading's accuracy. Therefore, probes need to be cleaned regularly to prevent the accumulation of dirt and salt crystals.
Growers need as well to understand that pH meters have a limitation in the accurate measurement of the pH value. Hobby meters, which are usually used by growers, might display a slightly different reading from the laboratory bench meters.
Hobby meters can cost up to $250 but they are cheaper versions in contrast to the laboratory pH meters. Laboratory pH meters are priced around $1000. Nevertheless, if the difference is just 0.3 or less, this difference is not that significant to generalize that the pH meter reading from the hobby meters is inaccurate. Thus, growers need not to worry about their pH readings from hobby meters. After all, who would spend a thousand dollars for a typical hydroponic garden?
Digital readouts pH meters have the advantage of being easier to read and more accurate in pH value as it eliminates the human error in gathering the data and interpretation. Moreover, digital types have wider pH range readout than the analog type.
Lastly, after the digital pH meter is calibrated, the scale on the display does not limit the pH range that the meter can measure with acceptable accuracy.
About the Author
http://www.BluelabAssist.com/ manufactures the World's best hand-held PH meter for measuring pH, conductivity and temperature of a liquid. Our equipment has a 5 year Guarantee and Free Shipping world wide
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