Exposed Probe (inches)		PSI Mohs' N0. 3		Mpa Mohs' N0. 3		PSI Mohs' N0 .4		Mpa Mohs' N0.4		PSI Mohs' N0.5		Mpa Mohs' N0.5		PSI Mohs' N0.6		Mpa Mohs' N0.6		PSI Mohs' N0.7		Mpa Mohs' N0.7
	1.275		-		-		-		-		-		-		-		-		-		-
	1.3		-		-		-		-		-		-		-		-		-		-
	1.325		-		-		-		-		-		-		-		-		-		-
	1.35		-		-		-		-		-		-		-		-		-		-
	1.375		-		-		-		-		-		-		-		-		-		-
	1.4		3000		20.697		-		-		-		-		-		-		-		-
	1.425		3175		21.9043		-		-		-		-		-		-		-		-
	1.45		3325		22.9391		-		-		-		-		-		-		-		-
	1.475		3500		24.1465		-		-		-		-		-		-		-		-
	1.5		3675		25.3535		3000		20.697		-		-		-		-		-		-
	1.525		3825		26.3886		3175		21.9043		-		-		-		-		-		-
	1.55		4000		27.596		3350		23.1115		-		-		-		-		-		-
	1.575		4175		28.8033		3525		24.3189		-		-		-		-		-		-
	1.6		4325		29.8381		3700		25.5263		3050		21.0419		-		-		-		-
	1.625		4500		31.0455		3875		26.7336		3225		22.2492		-		-		-		-
	1.65		4675		32.2528		4050		27.9409		3400		23.4566		-		-		-		-
	1.675		4825		33.2876		4225		29.1482		3600		24.8364		-		-		-		-
	1.7		5000		34.495		4400		30.3556		3775		26.0437		3000		20.697		-		-
	1.725		5175		35.7023		4575		31.5629		3950		27.2510		3200		22.0768		-		-
	1.75		5325		36.7371		4750		32.7702		4150		28.6308		3400		23.4566		-		-
	1.775		5500		37.9445		4925		33.9775		4325		29.8381		3600		24.8364		-		-
	1.8		5675		39.1518		5100		35.1849		4500		31.0455		3800		26.2162		3000		20.697
	1.825		5825		40.1866		5275		36.3922		4700		32.4253		4000		27.596		3225		22.2492
	1.85		6000		41.394		5450		37.5995		4875		33.6326		4200		28.9758		3425		23.6290
	1.875		6175		42.6013		5625		38.8068		5050		34.8399		4400		30.3556		3650		25.1813
	1.9		6325		43.6361		5800		40.0142		5250		36.2197		4600		31.7354		3875		26.7336
	1.925		6500		44.8435		5975		41.2215		5425		37.4270		4800		33.1152		4100		28.2859
	1.95		6675		46.0508		6150		42.4288		5600		38.6344		5000		34.495		4300		29.6657
	1.975		6825		47.0856		6325		43.6361		5800		40.0142		5200		35.8748		4525		31.2179
	2		7000		48.293		6500		44.8435		5975		41.2215		5400		37.2546		4750		32.7702
	2.025		7175		49.5003		6675		46.0508		6150		42.4288		5600		38.6344		4975		34.3225
	2.05		7325		50.5351		6850		47.2581		6350		43.8086		5800		40.0142		5175		35.7023
	2.075		7500		51.7425		7025		48.4654		6525		45.0159		6000		41.394		5400		37.2546
	2.1		7675		52.9498		7200		49.6728		6700		46.2233		6200		42.7738		5625		38.8068
	2.125		7825		53.9846		7375		50.8801		6900		47.6031		6400		44.1536		5850		40.3591
	2.15		8000		55.192		7550		52.0874		7075		48.8104		6600		45.5334		6050		41.7389
	2.175		8175		56.3993		7725		53.2947		7250		50.0177		6800		46.9132		6275		43.2912
	2.2		8325		57.4341		7900		54.5021		7450		51.3975		7000		48.293		6500		44.8435
	2.225		8500		58.6415		8075		55.7094		7625		52.6048		7200		49.6728		6725		46.3957
	2.25		8675		59.8488		8250		56.9167		7800		53.8122		7400		51.0526		6925		47.7755
	2.275		8825		60.8836		8425		58.1240		7975		55.0195		7600		52.4324		7150		49.3278
	2.3		9000		62.091		8600		59.3314		8175		56.3993		7800		53.8122		7375		50.8801
	2.325		9175		63.2983		8775		60.5387		8350		57.6066		8000		55.192		7600		52.4324
	2.35		9325		64.3331		8950		61.7460		8525		58.8139		8200		56.5718		7800		53.8122
	2.375		9500		65.5405		9125		62.9533		8725		60.1937		8400		57.9516		8025		55.3644
	2.4		9675		66.7478		9300		64.1607		8900		61.4011		8600		59.3314		8250		56.9167
	2.425		9825		67.7826		9475		65.3680		9075		62.6084		8800		60.7112		8475		58.4690
	2.45		10000		68.99		9650		66.5753		9275		63.9882		9000		62.091		8675		59.8488
	2.475		-		-		9825		67.7826		9450		65.1955		9200		63.4708		8900		61.4011
	2.5		-		-		10000		68.99		9625		66.4028		9400		64.8506		9125		62.9533
	2.525		-		-		-		-		9825		67.7826		9600		66.2304		9350		64.5056
	2.55		-		-		-		-		10000		68.99		9800		67.6102		9550		65.8854
	2.575		-		-		-		-		-		-		10000		68.99		9775		67.4377
	2.6		-		-		-		-		-		-		-		-		10000		68.99

Important Instructions
This Table is used only for the STANDARD POWER System, operated in accordance with the manufacture Instruction Manual.

The table represents the results of calibrating the system to the velocity of the probe at the STANDARD POWER position.

STANDARD POWER is used for testing concrete in existing structures cured longer than 28 days.

ALWAYS change to LOW POWER if the Probe System, used at standard power, indicates less than 3000 psi.

This Table, No. 1, has no fixed relationship to Table No. 2. Each Table has been calibrated independent to the respective probe velocity. A point of convergence will occur in the range of 3600 psi, and vary slightly, depending on the design mix.

NOTE: If the speed (velocity) of a crushing press was changed for braking standard cylinders, a separate calibration formula for computing psi would also be required.

Always confirm the Mohs’ Number of coarse aggregate with a Mineral Scratch Test or calibrate the System to standard cylinders.

For standard weight concrete (>125 lbs./cu ft.), use Silver color PPRS-01 (1/4 inch diameter probe) and read results in appropriate Mohs’ column from Table No.1.

For lightweight concrete (<125 lbs./cu ft), use Gold color PRS-03 (5/16 inch diameter probe) and read results in No. 3, column from Table No. 1 or apply the appropriate correction factor shown in the L.W. Table below.

For mortar (no coarse aggregate concrete), use appropriate probe for concrete weight and read results in Mohs’ No. 3 column from the Table.